1、That is an old book. (变为复数形式)

　　______ _______ old _______.

15．I'm ________(worry)about my party.

14．The children are playing ________(happy)over there.

13．We can't only think of _________(we).

12．Nice _______(talk)to you!

11．Do you enjoy _________(play)football or basketball?

10．The dog makes the baby _________(laugh)again and again.

9．Mrs. Parley is busy ________(do)the housework.

8．It's true ________(say)a dog is a man's best friend or at least Robert's best friend.

7．It takes me _______(a lot)time to do my homework.