The computer system __________ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
I often think of the years ____ I worked with the foreigners, ____ has had a great effect on my later life.
| A．that; which | B．when; which | C．which; that | D．when; who |
He expressed his hope ____ he would visit China again the next year, and this was the very hope ____ he expressed as soon as he arrived in the country.
| A．that; that | B．which; which | C．that; which | D．which; that |
____ has finished the task ahead of time will be rewarded, though we don’t know who it will be.
| A．Those who | B．Anyone | C．Whoever | D．Who |
The changes in our chemistry lab will cost quite a lot, ____ they will save us money in the long run.
| A．or | B．since | C．for | D．but |
Living things are dying out quickly. Let’s ask ____ destroying them in the past years.
| A．what part people have been playing |
| B．people have played in |
| C．what part people have played in |
| D．people have been playing what part |