C．用括号内所给单词的适当形式填空。
【小题1】He needs 500 _________(dollar).
【小题2】How much __________(be) the trousers?
【小题3】He wants _______(play) volleyball.
【小题4】His brother likes ___________(watch) TV.
【小题5】The red skirts are on __________ (sell) today.