The China National Environmental Monitoring Center ____ air quality in urban areas from levels one to five: excel-lent, fairly good, slightly polluted, poor and dangerous.[ ]

I’d appreciate________if you tell me some knowledge about rock music.[ ]

The trip shouldn’t take more than an hour.—_______.It is at least two hours.

In order to finish the task______， she works day and night and doesn’t measure the cost to her health.[ ]

Alan, it’s late. Why not go to bed— Jenny hasn’t come back yet. I ______ for her.