用所给动词的适当形式填空。

11. －Why isn’t Jim here?

－He’s busy. He ___________（take） care of his aunt’s baby at home now.

12.－What’s Mr. Clarke going to do tomorrow?

　　　 －He’ll go fishing if it____________（not rain）.

13. Linda_____________ （make） a lot of friends since she came here last autumn.

14.－Did Jack finish__________ （clean） the house this morning?－Yes, he did.

15.－ Have you heard of the Great Wall, Mr. Read?

　－Yes. It’s a place of great interest in China. It ________（build） thousands of years ago.