Because they hadn’t booked a room in advance，there were left when they arrived at the hotel．
| A．none | B．no one | C．nobody | D．nothing |
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 |
______ for two days, Steve managed to finish his report on schedule.
| A．To work | B．Worked |
| C．To be working | D．Having worked |