要求：1.要选择所有正确的答案（二,三个都可以）.
2.要写出为什么这样做.
1.You should ___________listen to your teacher in class.
2.You shoule be _____________in listening to your teacher in class.
3.You should listen to your teacher in class with_________.
4._____________is mececcary in listening to your teacher in class.
A.care
B.careful
C.carefully
D.carefulness