You’d better ask Mr Wang for help when _______ problems.—I see, but I’m not sure when _______ time.

Finally she got too tired and fell asleep at the desk, her right hand still ______ a pen.[ ]

The man knocked her _____ her bike and _____ her lying on the ground

Kumming is famous ________ its beautiful scenery(风景).

driving, which was once a occurrence,is now under control