Tom　was　so　careless　that　he　_____　his　right　arm　when　he　was　riding　to　school.

She looks very sad. I want to help her, but I just don’t know ____ to do it.

Do you have to do this weekend?

The teacher asks them to look_____ the blackboard. [ ]

Last week Lily’s father bought her__________MP4 as___________birthday present.