They will fly to Washington, ______they plan to stay for two or three days.
| A．which | B．where | C．there | D．when |
Never before______ such a wonderful park, ______ I'd like to pay a visit again.
| A．had I seen; where | B．have I seen; which |
| C．have I seen; where | D．had I seen; which |
impresses me most isChinese students are well organized and disciplined. We should learn from them.
| A．Which; what | B．What; that | C．What; whether | D．That; what |
It be the vocabulary that caused you the problem in the exercise because you know a lot of words.
| A．couldn’t | B．may | C．should | D．needn’t |
Mr. Zhang once taught in a remote village in Anhui province as a volunteer, which was ______ only on foot.
| A．accessible | B．acceptable | C．available | D．appropriate |
This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.
| A．have reflected | B．are reflecting | C．will reflect | D．reflected |