---Mr. White didn’t come last night, did he? ---No. We for him. A whole night was wasted. A. had waited B. have been waiting C. were waiting D, had been waiting
---Does China have cultural relics?
--- Yes, it is admitted that many cultural relics in the world, such as the Great Wall, the Potala Palace, the Magao Caves and so on, ______ China.
All the students at school are required to ____ lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.