21. Britain is European country. It is also island country.
A. an; a B. the; an C. a; an D. a n; an
22. 一Mum，why must I stop a rest?
一Playing computer games is bad for your eyes.
A. having; too much B. having; too many
C. to have; too much D. to have; too many
23. 一He's never been late for school, he?
一 ，he always arrives at school on time.
A. is; Yes B. has; No. C. has; Yes D. is; No
