Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
| A．has been raised | B．raised |
| C．has risen | D．rose |
Excuse me. II was blocking you
r way.
| A．didn’t realize | B．don’t realize |
| C．haven’t realized | D．wasn’t realizing |
–Can I help you? Are you looking for anything in particular today？
----_____， we’re just looking.
A．Yes， please |
B． No, thank you | C．Yes ， you can | D．No, you needn’t |
I’m afraid Mr.Harding ____ see you now . he’s busy.
| A． can’t | B． mustn’t | C． shouldn’t | D．needn’t |
I refuse to accept the blame for something _____ was someone else’s fault.
| A．who | B． that | C．as | D．what |
Linda ，make sure the tables ____ before the guests arrive.
| A．be set | B． set | C．are set | D． are setting |