21. sometimes , sometime , some time
(1)They visited our school _____ last year .
(2)It took me _____ to do the work .
(3)_____ I watch TV in the evening .
19. either , any
(1)You may take of the two books .
(2)Here are three balls . You can take of them .
17. each , every
(1) student must work hard at his lessons .
(2) has his own name .
16. what , how
(1) a nice watch it is !
(2) hard she works !
(3) she missed her daughter !
15. everyone , every one
(1) of the books is very useful .
(2) likes sports .
14. take , bring
(1)May I this book home ?
(2)Remember to the box here tomorrow .
13. look for , find
(1)I him at home at last .
(2)I’m him now . Do you see him ?
12. borrow , lend
(1)I a book from the library yesterday .
(2)You mustn’t it to others .
11. go to bed , go to sleep
(1)It’s time to .
(2)He was tired . He as soon as he sat down .
10. look at , see
(1)I didn’t any boats on the river .
(2)What are they ?