That she hadn’t kept her ____ on her work resulted in the failure.
| A．head | B．heart | C．brain | D．mind |
_______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
| A．What | B．Though what | C．In spite of what | D．However what |
When a giraffe has ______ drink, it has to stand with its front legs wide apart in order to reach ______ water easily.
| A．不填；不填 | B．a; the | C．the; 不填 | D．不填；the |
If we ___________some measures, we might have prevented the environmental pollution.
| A．take | B．had taken | C．took | D．have taken |
–May I smoke in the room?
--No, you______________. It’s a non-smoking room..
| A．mightn’t | B．won’t | C．needn’t | D．mustn’t |
---It’s a long time ______ I last saw you.
---Yes, and it will be another month ______ we can meet again.
| A．before; when | B．when; since | C．since; while | D．since; before |