Do you know ______in Japan?
| A．when nuclear(核) accidents happened | B．when did nuclear accidents happen |
| C．when nuclear accidents happen | D．when do nuclear accidents happen |
—Tom, you shouldn’t be so ____________. You always leave your things here and there.
—Sorry, Mom. I’ll put them away soon.
| A．terrified | B．cheerful |
| C．careless | D．frightened |
During the rainy days, I prefer to stay at home ___________ go out.
| A．rather | B．rather than |
| C．instead | D．instead of |
John ___________ on his friend when he went to Guangzhou last month.
| A．dropped on | B．dropped in |
| C．dropped at | D．dropped for |
—Paper ___________ wood. We should not waste paper.
—I agree. I always use __________ sides of paper.
| A．is made of; either | B．is made from; both |
| C．makes of; both | D．makes from; either |
Are you familiar _____________ the rules of baseball?
| A．of | B．from |
| C．to | D．with |