When it______ air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.
| A．refers to | B．comes to | C．happens to | D．speaks to |
Is it, in your opinion, possible __________ new measures will be taken to improve the terrible traffic?
| A．whether | B．what | C．when | D．that |
—__________ I hand in my report as soon as the class is over?
—No, you needn’t. Anytime this week is okay.
| A．May | B．Must | C．Shall | D．Can |
The headmaster will __________ a speech to the visiting foreign guests this afternoon.
| A．deliver | B．address | C．announce | D．declare |
To our disappointment, the trip we had been looking forward to __________ in the pouring rain.
| A．starting | B．start | C．to start | D．started |
As you can see, we need the equipments, ___________ are necessary to make the project move on.
| A．all of which | B．all of them | C．all that | D．all what |