Grammar worksheet focusing on coordinating conjunctions, where students fill in the blanks with appropriate conjunctions to complete sentences.

To solve the problem, we need to complete the sentences using the coordinating conjunctions "and," "but," "or," "for," or "so." Let's analyze each sentence and choose the appropriate conjunction.

Solutions:

1. He was very tired after a long working day, _he washed all the dishes in the kitchen.
- Conjunction: but
- Explanation: The sentence contrasts his tiredness with his action of washing dishes.
- Completed Sentence: He was very tired after a long working day, but he washed all the dishes in the kitchen.

2. Miriam bought apples, oranges, carrots, lemons _ potatoes from the market in the city center.
- Conjunction: and
- Explanation: The list of items is being continued.
- Completed Sentence: Miriam bought apples, oranges, carrots, lemons and potatoes from the market in the city center.

3. Mr. Robertson should stop smoking cigarettes immediately _ he will get seriously ill.
- Conjunction: for
- Explanation: This explains the reason why Mr. Robertson should stop smoking.
- Completed Sentence: Mr. Robertson should stop smoking cigarettes immediately for he will get seriously ill.

4. I forgot to take my umbrella with me _ I got soaked under the heavy rain yesterday morning.
- Conjunction: so
- Explanation: The result of forgetting the umbrella is getting soaked.
- Completed Sentence: I forgot to take my umbrella with me so I got soaked under the heavy rain yesterday morning.

5. Benjamin could get the job easily _ he was the only applicant for that position in the company.
- Conjunction: for
- Explanation: This explains the reason why Benjamin could get the job easily.
- Completed Sentence: Benjamin could get the job easily for he was the only applicant for that position in the company.

6. He got up very late. He could neither have something to eat _ have something to drink.
- Conjunction: nor
- Explanation: "Neither...nor" is used to show two negative options.
- Completed Sentence: He got up very late. He could neither have something to eat nor have something to drink.

7. My mother vacuumed the floor _ I dusted the furniture last weekend.
- Conjunction: and
- Explanation: These are two actions performed together.
- Completed Sentence: My mother vacuumed the floor and I dusted the furniture last weekend.

8. Our maths teacher gave her a punishment _ she was late for class for the third time this week.
- Conjunction: for
- Explanation: This explains the reason for the punishment.
- Completed Sentence: Our maths teacher gave her a punishment for she was late for class for the third time this week.

9. I didn't have enough money to buy the laptop I liked _ I borrowed some money from my friend.
- Conjunction: so
- Explanation: The result of not having enough money is borrowing from a friend.
- Completed Sentence: I didn't have enough money to buy the laptop I liked so I borrowed some money from my friend.

10. Samuel really wanted to go to the pop concert _ he had to study for the French exam.
- Conjunction: but
- Explanation: There is a contrast between his desire to go to the concert and his obligation to study.
- Completed Sentence: Samuel really wanted to go to the pop concert but he had to study for the French exam.

11. Either you finish the English project on time _ the teacher will give you a bad mark.
- Conjunction: or
- Explanation: This presents an alternative condition.
- Completed Sentence: Either you finish the English project on time or the teacher will give you a bad mark.

12. James neither knew her telephone number _ her home address. He couldn't reach her.
- Conjunction: nor
- Explanation: "Neither...nor" is used to show two negative options.
- Completed Sentence: James neither knew her telephone number nor her home address. He couldn't reach her.

13. Mrs. Cunningham had enough money to buy a new car _ she couldn't decide which one to choose.
- Conjunction: but
- Explanation: There is a contrast between having enough money and being unable to decide.
- Completed Sentence: Mrs. Cunningham had enough money to buy a new car but she couldn't decide which one to choose.

14. The students decided not to go out in the break _ it was snowing heavily.
- Conjunction: for
- Explanation: This explains the reason for their decision.
- Completed Sentence: The students decided not to go out in the break for it was snowing heavily.

Final Answer:

\boxed{
1. but, 2. and, 3. for, 4. so, 5. for, 6. nor, 7. and, 8. for, 9. so, 10. but, 11. or, 12. nor, 13. but, 14. for
}