I often think of my home town, _______I lived a happy life.
| A．who |
| B．when |
| C．where |
| D．which |
19. It is reported that China has created the first man-made sun in the world recently, ______ ?
| A．isn’t it | B．is it | C．hasn’t it | D．has it |
18. ----- Has Mary finished writing her article ?
----- No, and it _____ before class was over.
| A．should be finished | B．should finish |
| C．should have finished | D．ought to have been finished |
17. I really _____ thank you enough. It’s been an amazing day.
| A．needn’t | B．should | C．must | D．Cannot |
16. The computer program is a puzzle to me. The more I think of it, the more questions I think of _____.
| A．ask | B．asked | C．being asked | D．to ask |
15. Realizing I would be late , I quickly dressed my son and _____ my bag, went to work.
| A．carried | B．carrying | C．to carry | D．having carried |