----Can you tell me ______ live a low-carbon(低碳) life ?
----OK. By using both sides of the paper.
| A．where’s | B．why to | C．when to | D．how to |
I really enjoyed your speech, ______ there were some parts I didn’t quite understand.
| A．because | B．unless | C．though | D．after |
My grandfather loves keeping pets．He said a pet could help a person feel______.
| A．more nervous | B．less alone | C．less lonely | D．more worried |
----Where is Tom?
----He’s left a(n) _____ saying that he has something important to do.
| A．excuse | B．sentence | C．news | D．message |
The problem is too difficult for him. He _______ solve it by himself without any help.
| A．can't | B．mustn't | C．shouldn't | D．needn't |