____ abroad for two years, the two astronauts went back home last year.
| A．Educating | B．Educated | C．Having been educated | D．being educated |
Unfortunately, the computer system ________ suddenly while they were searching for some information on the Internet.
| A．broke up | B．broke down |
| C．broke away | D．broke out |
______with the size of the whole earth, the biggest ocean does not seem big at all.
| A．Compare | B．When comparing |
| C．Comparing | D．When compared |
Alice’s father always brings her a nice gift ________ he returns home from his business trip.
| A．by the time | B．all the time |
| C．every time | D．in the time |
Having walked in the desert for several days, they felt exhausted, but they had to find a pool before the water in the bottle ___________ .
| A．put out | B．let out |
| C．ran out | D．used up |
It is very hot in Chongqing this summer. ________air－conditioners have been sold since the temperature is high.
| A．Large quantities of | B．A large quantity |
| C．A great deal of | D．A great many of |