Air pollution is getting more and more serious, so we must take action __________ it is too late.
| A．before | B．after |
| C．until | D．when |
The little girl, with tears ___ down her cheeks, stopped crying suddenly when given an apple.
| A．having rolled | B．to roll |
| C．rolled | D．rolling |
The boy and his father ___ abroad for a few days when they were free last summer.
| A．stayed | B．have stayed | C．had stayed | D．were staying |
South-to-North Water Diversion Project will largely___ Beijing’s dependence on underground water.
| A．affect | B．adjust | C．ease | D．Settle |
A house next to the key middle school costs about ___ of one in other districts.
| A．the price of three times |
| B．three times the price |
| C．as much as the three times price |
| D．three times more than the price |
Recently many students in China focus too much on their academic learning rather than play and communicate, which ___ influences their character development.
| A．occasionally | B．finally |
| C．dramatically | D．Consequently |