______, I suppose, and the housing problems for the low-income families could be solved.
| A．If you double your efforts | B．To make some more efforts |
| C．Some more efforts | D．Making greater efforts |
People are advised to lay particular ____ the need of a balanced diet and proper exercise.
| A．stress on | B．importance of | C．stress to | D．attempt at |
David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.
| A．experiment | B．intention | C．aim | D．attempt |
---I saw Mr. Smith at Xianyang Airport this morning.
---You ____. He’s still on holiday in Hawaii.
| A．can’t | B．couldn’t have | C．mustn’t have | D．needn’t |
_____ much advice I gave her, she did what she wanted to do.
| A．However | B．Whatever | C．How | D．No matter |
---- How did you know the surprising news?
---- I happened ____ the event then.
| A．to cover | B．to be covering | C．covering | D．to have covered |