China is one of the largest countries in the world，________9.6 million square kilometres.
| A．to cover |
| B．covered |
| C．covers |
| D．covering |
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．spent | B．am spending | C．spend | D．will spend |