A: Mum, may I go out to play football for an hour?
B: No, you_ . The air outside is not very clean.
A. can't B. needn't C. couldn’t
--Is the man standing outside the teacher’s office Mr. Zhou?
--No, it ______ be him. He has gone to Hong Kong for an academic conference.
| A．mustn’t | B．can’t | C．needn’t | D．couldn’t |
Parents shouldn’t do all the things for their children because too much ______ prevents children’s development.
| A．protection | B．pollution | C．exploration | D．application |
–It’s said that Wang Meng spent almost 10 hours training every day.
--That’s true. She is really hard-working. ______, she won 3 golden medals in the 21st Winter Olympics.
| A．By the way | B．First of all | C．As a result | D．In order to |
We only heard about the meeting yesterday, so it ______ yet.
| A．didn’t prepare | B．hasn’t prepared |
| C．wasn’t prepared | D．hasn’t been prepared |
–How soon can you finish the work?
--We can finish it in 20 minutes if we have one more person ________ us.
| A．to help | B．helps | C．helped | D．helping |