____ do you study for a math test? —I study math ____ lots of exercises.

Why are you standing there, Kangkang? —I can’t see the blackboard clearly. Two tall boys are sitting______me. [ ]

I feel very angry when hearing that Japanese government tries to _________ Diaoyu Island.

“Did you have any difficulty in yesterday’s homework?”—“No, in fact I found _____.”

The boat went the lake.[ ]