Educational worksheet on idioms with visual examples and sentence completion exercises.

Let’s go through each sentence one by one and match it with the correct idiom from the list. We’ll think about what each sentence means, then pick the idiom that fits best — sometimes we may need to change the form (like tense or pronoun) to make it grammatically correct.

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a) *I have to tell you something that will _______________.*
→ This is about telling someone a secret or surprising news. The idiom “let the cat out of the bag” means to reveal a secret. But here, it says “will ___”, so we need future tense: let the cat out of the bag → but since it’s “will”, we use base verb: let the cat out of the bag
Wait — actually, looking at context: “I have to tell you something that will ___” — this could also be “knock your socks off” if it’s amazing news. Let’s check others first.

Actually, let’s look at all options together.

Better approach: Go sentence by sentence and match meaning.

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b) *He _______________ when he accidentally told her about the surprise party.*
→ He revealed a secret by accident → let the cat out of the bag

But wait — in part (a), if (b) is “let the cat out of the bag”, then (a) might be different.

Let’s reassign carefully.

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Let me list all idioms and their meanings again for quick reference:

- in hot water = in trouble
- butterflies in one’s stomach = nervous/anxious
- under the weather = sick/sad/low energy
- hold your horses = wait/slow down
- a piece of cake = very easy
- knock one’s socks off = amaze/impress/delight
- let the cat out of the bag = reveal a secret (often accidentally)
- at the drop of a hat = immediately
- cost an arm and a leg = very expensive
- pull one’s leg = joke/tease
- caught between two stools = can’t choose between two things
- lose one’s marbles = act crazy/strange
- hit the sack = go to bed
- all ears = eager to listen
- cold feet = lose courage before doing something planned

Now match sentences:

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a) *I have to tell you something that will _______________.*
→ Something exciting or amazing? → knock your socks off
Yes! “Will knock your socks off” = will amaze you. Fits perfectly.

✔ a) knock your socks off

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b) *He _______________ when he accidentally told her about the surprise party.*
→ Accidentally revealed a secret → let the cat out of the bag
Past tense needed → let the cat out of the bag (past tense of “let” is still “let”)

✔ b) let the cat out of the bag

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c) *Okay, I’ll tell you what I’m going to do, although you’ll probably think that I have _______________.*
→ Think I’m acting crazy? → lost my marbles
“have lost my marbles” → present perfect → fits “you’ll think that I have...”

✔ c) lost my marbles

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d) *I’m _______________ with my teacher because she caught me cheating in the test.*
→ In trouble → in hot water

✔ d) in hot water

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e) *I’d better _______________ now. I’m feeling really exhausted.*
→ Go to bed → hit the sack

✔ e) hit the sack

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f) *He is so cute that when he looks at me I get _______________.*
→ Nervous/excited → butterflies in my stomach

✔ f) butterflies in my stomach

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g) *We’re all packed and ready to go - we can leave _______________.*
→ Immediately → at the drop of a hat

✔ g) at the drop of a hat

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h) *I am feeling a bit _______________ – I think I’m getting a cold.*
→ Sick → under the weather

✔ h) under the weather

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i) *Is Samantha really getting married or are you just _______________?*
→ Joking/teasing → pulling my leg

✔ i) pulling my leg

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j) *Was your Math exam hard? – No, it was really _______________.*
→ Very easy → a piece of cake

✔ j) a piece of cake

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k) *My friend got _______________ and decided not to do a bungee jump.*
→ Lost courage → cold feet

✔ k) cold feet

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l) *Just _______________! Let’s think about this for a moment.*
→ Wait/slow down → hold your horses

✔ l) hold your horses

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m) *Tell me who was at the party. I am _______________.*
→ Eager to hear → all ears

✔ m) all ears

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n) *If you try to please both your father and mother, you can end up _______________.*
→ Can’t choose between two → caught between two stools

✔ n) caught between two stools

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o) *I don’t know how you could afford this sports car. It must have _______________.*
→ Very expensive → cost an arm and a leg

✔ o) cost an arm and a leg

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Double-checking all:

a) knock your socks off → yes, amazing news
b) let the cat out of the bag → revealed secret
c) lost my marbles → acting crazy
d) in hot water → in trouble
e) hit the sack → go to bed
f) butterflies in my stomach → nervous
g) at the drop of a hat → immediately
h) under the weather → sick
i) pulling my leg → joking
j) a piece of cake → easy
k) cold feet → lost courage
l) hold your horses → wait
m) all ears → listening eagerly
n) caught between two stools → stuck between choices
o) cost an arm and a leg → expensive

All fit logically and grammatically.

Final Answer:
a) knock your socks off
b) let the cat out of the bag
c) lost my marbles
d) in hot water
e) hit the sack
f) butterflies in my stomach
g) at the drop of a hat
h) under the weather
i) pulling my leg
j) a piece of cake
k) cold feet
l) hold your horses
m) all ears
n) caught between two stools
o) cost an arm and a leg