—Is that boy Alan?
—No, it ______ be him. He left for Beijing yesterday.
| A．can’t | B．shouldn’t | C．needn’t | D．mustn’t |
--- The weather is very good. Let’s go to the seaside.--- ___________. Why not?
| A．Have fun | B．Not really |
| C．Sounds fine | D．Not at all |
I heard that a great fire _________ when I was out in Tianjin last night.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
—Why didn’t you try your best to get on the subway (地铁)?
—I tried to, but it started moving _______ I could get on it.
| A．before | B．while | C．as soon as | D．after |
I really enjoyed his speech, ________ there were some parts I didn’t quite understand.
| A．because | B．unless | C．though | D．after |
---Excuse me, Mum. When can we have dinner?
---Not until it ___________ in half an hour.
| A．is prepared | B．will be prepared |
| C．has been prepared | D．was prepared |