Failure is never pleasurable,but it can make a positive contribution to your life ___you learn to use it
| A．since |
| B．once |
| C．until |
| D．unless |
You can’t imagine what difficulty we had _______ home in the snowstorm.
| A．walked | B．walk | C．to walk | D．walking |
—Has your father returned from Africa yet?
—Yes,but he _______ here for only three days before his company sent him to Australia.
| A．was | B．has been | C．will be | D．would be |
We had to wait half an hour _______ we had already booked a table.
| A．since | B．although | C．until | D．before |
Don’t be _______ by products promising to make you lose weight quickly.
| A．taken off | B．taken out |
| C．taken away | D．taken in |
-Turn off the TV,Jack.your homework now?
-Mum,just ten more minutes,please.
| A． | Should you be doing | B． | Shouldn't you be doing |
| C． | Couldn't you be doing | D． | Will you be doing |