—Are you going to stay overnight?
—Not _____ it’s really necessary．
| A．unless | B．if | C．until | D．since |
Five minutes earlier, and we the last bus now.
| A．had caught |
| B．should have caught |
| C．could catch |
| D．caught |
cease advertising, prices would be significantly reduced
| A．Were they to |
| B．Could they |
| C．Were they to |
| D．Would they |
He must have had an accident, or he here then.
| A．would have been |
| B．had been |
| C．should be |
| D．could be |
If only you him what I said, everything would have been all right.
| A．didn’t told |
| B．hadn’t told |
| C．would not tell |
| D．would have not told |
It’s high time we our attention to this problem．
| A．turned |
| B．turn |
| C．had turned |
| D．would turn |