Educational worksheet on prefixes and suffixes for language learning, designed to help students form new words and complete sentences.

Task Explanation:

The task requires you to use prefixes or suffixes from the given lists to form new words that fit into the sentences provided. The goal is to complete each sentence with a word derived by adding a prefix or suffix to the root word in parentheses.

#### Prefixes:
- DIS-
- UN-
- IM-
- RE-

#### Suffixes:
- -ING
- -ED
- -ANCE
- -FUL
- -ABLE
- -LY
- -OUS
- -ER

Solution:

1. I can't answer this question. It's __________ (POSSIBLE).
- Prefix: IM-
- Word: IMPOSSIBLE
- Sentence: I can't answer this question. It's impossible.

2. Don't stand near the water. It's too __________ (DANGER).
- Suffix: -OUS
- Word: DANGEROUS
- Sentence: Don't stand near the water. It's too dangerous.

3. I don't like this fish. It's not very well __________ (COOK).
- Suffix: -ED
- Word: COOKED
- Sentence: I don't like this fish. It's not very well cooked.

4. Kate started crying because she was so __________ (HAPPY).
- Prefix: UN-
- Word: UNHAPPY
- Sentence: Kate started crying because she was so unhappy.

5. If you have a haircut, it will change your __________ (APPEAR).
- Suffix: -ANCE
- Word: APPEARANCE
- Sentence: If you have a haircut, it will change your appearance.

6. Paul never waits in queues. He is too __________ (PATIENT).
- Prefix: IM-
- Word: IMPATIENT
- Sentence: Paul never waits in queues. He is too impatient.

7. Thank you for your advice. You have been very __________ (HELP).
- Suffix: -FUL
- Word: HELPFUL
- Sentence: Thank you for your advice. You have been very helpful.

8. Stealing other people's money is __________ (HONEST).
- Prefix: DIS-
- Word: DISHONEST
- Sentence: Stealing other people's money is dishonest.

9. Our science __________ is very young. (TEACH)
- Suffix: -ER
- Word: TEACHER
- Sentence: Our science teacher is very young.

10. Harry didn't think the book was very __________ (INTEREST).
- Suffix: -ING
- Word: INTERESTING
- Sentence: Harry didn't think the book was very interesting.

11. A million pounds was given to the hospital by an __________ person (KNOWN).
- Prefix: UN-
- Word: UNKNOWN
- Sentence: A million pounds was given to the hospital by an unknown person.

12. When you __________ this paragraph, make it a bit shorter (WRITE).
- Suffix: -ING
- Word: WRITING
- Sentence: When you write this paragraph, make it a bit shorter.

13. Mary was wearing a/an __________ hat (USUAL).
- Prefix: UN-
- Word: UNUSUAL
- Sentence: Mary was wearing a/an unusual hat.

14. That was a great film. It was really __________ (ENJOY).
- Suffix: -ABLE
- Word: ENJOYABLE
- Sentence: That was a great film. It was really enjoyable.

15. I like this town. The people are very __________ (FRIEND).
- Suffix: -LY
- Word: FRIENDLY
- Sentence: I like this town. The people are very friendly.

16. I don't think you're right. I __________ with you completely (AGREE).
- Prefix: DIS-
- Word: DISAGREE
- Sentence: I don't think you're right. I disagree with you completely.

Final Answers:

1. impossible
2. dangerous
3. cooked
4. unhappy
5. appearance
6. impatient
7. helpful
8. dishonest
9. teacher
10. interesting
11. unknown
12. writing
13. unusual
14. enjoyable
15. friendly
16. disagree

Final Answer:
\boxed{
1. impossible, 2. dangerous, 3. cooked, 4. unhappy, 5. appearance, 6. impatient, 7. helpful, 8. dishonest, 9. teacher, 10. interesting, 11. unknown, 12. writing, 13. unusual, 14. enjoyable, 15. friendly, 16. disagree
}