________it was a waste of time and energy，but she didn’t accept my advice.

_____ Browns are going shopping this Saturday. They are going to buy _____usefulumbrella.

hinahave cultural relics— Yes, it is admitted that many cultural relics in theworld, such as the Great Wall, the Potala Palace, the Magao Caves and so on,______ China.

下列各句中划线成语使用错误的一项是

It is most________that the environmentalists will come to the area to investigate the possible damage caused by the serious pollution. [ ]