Instructions for homework have to be ____ so that every student knows clearly what is to do after class.[ ]

18. He urged us to _____ this splendid opportunity to develop our movie industry.

The abrupt change of the climate has drawn __________ worldwide attention to __________ benefit of green energy .

Your digital camera is quite nice. Where did you buy_________ I want to buy _________， too.—On the Internet.

下列句子中不包含通假字的一项是