1、  —Is that shirt your brother’s?

2、  —Someone is knocking at the door. Who may it be?

3、  It’s _________ to do your homework, Laurence.

4、  _________ a lovely girl she is!

5、  It’s important for us _________ a healthy lifestyle.

6、  —What is _________ most useful invention in the 20th century?

7、  —What’s wrong with the book?

8、  He _________ China for many years.

9、  —Look at these stamps. I ________ them for five years.

10、  Of the three sisters, the youngest swims _________.

11、  In order to _________ the first bus, I will get up early tomorrow.

12、  Tom will call me as soon as he _________ home.

13、  The new zoo is ________ than the old one.

14、  He is so careful to _________ there are no mistakes in his homework.

15、  It _________ rain later today, but I’m not sure.