_____, the boy couldn't enter his house.
| A．Since the key had lost | B．The key being lost |
| C．Lost the key | D．Having lost the key |
．You’d better get the problem solved as soon as possible ______ it becomes out of control．
| A．when | B．before | C．since | D．unless |
—Happy Birthday, Ken! Did you invite Jason?
—Yes, but he _____ a meeting in New York otherwise he wouldn’t be absent from my birthday party．
| A．is attending | B．has attended | C．was attending | D．attended |
—Mom, can I have that transformer?
—Behave yourself and you____ have it．
| A．could | B．shall | C．must | D．may |
Liu Jialing won ___ Best Actress Award for her role at ___ 30th Hong Kong Film Awards．
| A．the,/ | B．a, the | C．the, the | D．/,the |
—Hi honey, are you okay? You look a little pale．
—________．I am too tired these days!
| A．Not at all | B．Don’t mention it | C．Go ahead | D．Forget it |