单项选择：
1. The no. 12 bus __________ to the Town Hall and not to the station.
A. has come B. has been going C. goes D. is going
2. Dont use that pen. It __________ smoothly .
A. didnt write B. dont write C. doesnt write D. isnt write
3. If it __________, I wont go for a walk.
A. rains B. will rain C. rained D. rain
4. The child is playing while his mother __________ dinner.
A. cooked B. cooks C. was cooking D. is cooking
5. He __________ in a cotton factory these day.
A. is working B. works C. will be working D. has been working