1、  Everything can't live __________ the sun.

2、 My mother is sleeping. Would you please ________ the radio?

3、  Mr. Smith has bought a lot of books, ________ he?

4、 I remember ________ it before somewhere.

5、 Five years ________ a long time.

6、  It takes ________ two days to finish his report.

7、  My little sister is five years old, __________ she can swim well.

8、  The mother ________ to the children: Be careful! Your sister is sleeping.

9、 He ________ a present but didn't ________ it.

10、 He works hard ________ pass the exam.

11、 The bag ________ mine. It's ________ full of books.

12、  Not until I began to work __________ how much time I had wasted.

13、 -Can you answer that question? -Sorry, I ________.

14、 Give me the answer ________ the question.

15、  I __________ go here this morning, so I stayed at home.