He climbed silently＿＿＿＿＿＿seizing the thief＿＿＿＿＿＿.
| A．in the purpose； by surprise | B．with purpose of； surprisingly |
| C．with purpose of； surprisedly | D．with the purpose of； by surprise |
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 |
John received an invitation to dinner, and with his work ________, he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |