【C14】A．beB．isC．to beD．being

There ________no danger, the police went back to their police office.A、beB、isC、areD、bei

【28】A．can beB．may beC．must not beD．may not be

Two years______a long time for a patient who has to lie in bed, and do nothing.A．areB．isC．

It is necessary that measures _____ taken right now.A: beB: must beC: will beD: can be

【C19】A．could beB．must beC．should beD．would be

【C9】A．areB．isC．beingD．to be