下列句子中各有一处错误，请选出来并在横线上改正。
【小题1】There arefourballoon. （______）_____________
A  B    C
【小题2】How many studentare there in your class?   （______）_____________
A    B C
【小题3】What do you do onan English class? （______）_____________
A   B  C
【小题4】Are you likemusic?    （______） _____________
A B   C
【小题5】There is two sofasin the living room.   （______）_____________
A B  C