We must make ___ to the public that something should be done to stop pollution.
| A．what is clear | B．it is clear | C．it clear | D．that clear |
Unable to find jobs, many young people take to illegal behavior, such as stealing, and were usually the main suspects _____ anything went missing.
| A．since | B．unless | C．when | D．though |
Provided that they are fit, I see no reason why they _____ go on playing basketball for another four or five years.
| A．needn’t | B．shouldn't |
| C．mustn’t | D．oughtn’t |
I have been staying up until midnight since Monday, _____ on my paper. I need to catch up on some sleep this weekend.
| A．working | B．worked |
| C．works | D．to work |
The place he suggested ______ hold the meeting is a five-star hotel.
| A．us to | B．to us to |
| C．for us to | D．to us |
It is said that he is focusing on another book on space exploration. When will it _____?
| A．come up | B．come to |
| C．come out | D．come about |