Greenland is _______ huge island that is mostly covered with_______ thick ice sheet.
| A．the; / | B．a; the | C．a; a | D．the; a |
I wish I ______ at my sister’s wedding last Tuesday, but I was on a business trip in New York then.
| A．will be | B．would be |
| C．have been | D．had been |
We need to get to the root of the problem______ we can solve it.
| A．while | B．after | C．before | D．as |
If you have any doubts about your health, you’d better______ your doctor at once.
| A．convince | B．consult | C．avoid | D．affect |
Tom had tothe invitation to the party last weekend because he was too busy.
| A． | turn in | B． | turn down |
| C． | turn over | D． | turn to |
Despite the previous rounds of talks, no agreement______ so far by the two sides.
| A．has been reached | B．was reached |
| C．will reach | D．will have reached |