2. The Xi’an _____ happened on December 12, 1936 in Chinese modern history.
| A．Incident | B．Accident | C．Event | D．Affair |
______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 |
Without electricity, people’s life ________ quite different today.
| A．would have been | B．should have been |
| C．would be | D．could have been |