There was so much smoke in the factory the workers were working _ the firefighters couldn’t see clearly.
| A．that; that |
| B．that; where |
| C．where; that |
| D．where; where |
No sooner ______ the room than we realized we to take our books.
| A．had we left ; forget | B．we had left ; forget |
| C．we had left ; forgot | D．had we left;forgot |
When you’re learning to play the piano, _______ a good teacher makes a big difference.
| A．have | B．having |
| C．and have | D．if have |
—Is the manager available tomorrow afternoon?
—No, he is busy. Otherwise he ________ the meeting.
| A．had attended | B．would have attended |
| C．would attend | D．could have attended |
— Mum, where is my ball? I remember I put it here yesterday.
— You _______ it in the wrong place.
| A．must put | B．might put |
| C．might have put | D．should have put |
On workday mornings I usually ________ an hour driving to work because of the traffic jam.
| A．spended | B．am spending |
| C．spend | D．will spend |