- He refused to tell us whether he ________ (undertake) the job.
- How long ________ they ________ (dig) the ditch?
- he teacher told them since light ________ (travel) faster than sound,lightning ________ (appear) to go before thunder.
- The director recommended that she ________ (study) more English before going abroad.
- “Have you moved into the new flat? ” “Not yet. The rooms ________ (paint). ”
- He fell asleep immediately last night; he must ________ (be) very tired.
- He asked me whether my brother ________ (fly) to Beijing.
- A great number of small power stations ________ (set up) in their county since liberation.
- Those who’d like to visit the exhibition ________ (sign) your names here.
- 采用分组存储转发和______机制是点对点式网络与广播式网络的重要区别之一。
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