_____ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
He made a mistake, but then he corrected the situation _it got worse.
| A．until | B．when | C．before | D．as |
E-mail, as well as telephones, ____an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．play |
______ on the top of the tower, and you can see the whole city.
| A．Standing | B．To stand | C．Stood | D．Stand |
—A naughty boy kept talking in class.
—Are you _____ Mike? It’s just like him to be so rude!
| A．coming across | B．looking down on | C．looking forward to | D．referring to |
It was the hard work and determination of the generation _____ had changed the opinion of people towards Chinese.
| A．why | B．when | C．that | D．which |