Here are the best answers to complete the sentences:

1. She was drinking **A. a** glass of orange juice.
2. It’s important to brush your **A. teeth** twice times a day.
3. We have a lot of **D. factories** near our house.
4. There are a number of excited **B. people** in the party.
5. She is really afraid of **C. mice**.
6. There are 30 **C. children** in this class.
7. Would you like to take a **C. photo**?
8. Mrs. Florida felt that her marriage had become **C. ∅** prison.
9. The scientists are working on **B. an** drug capable of arresting the spread of cancerous cells.
10. Did you see the new **C. radios** in that shop next door?
11. Peter never feels lonely. He has got **C. many** friends.
12. Mr. Johnson lived with his three **C. children** in the countryside.
13. My mother needs **A. some** milk to make a cake.
14. I’d like to buy **B. a pair of shoes**.
15. Let’s have a break. Would you like to have **A. any** coffee?
16. Look! There are **B. much seats** left over there.
17. **A. A lot of the information are** necessary.

Hope this helps!