To understand the grammar of the sentence，you must break it______ into parts．
| A．down | B．up | C．off | D．out |
Go back home now, Mary. Your parents ______ your safety.
| A．are concerned about | B．are concerned with |
| C．are concerned on | D．concern of |
Must I wait till you come back? No, you ______.
| A．mustn't | B．needn't |
| C．can't | D．won't |
It is in the school ______ he studied ten years ago ______ he gave a wonderful speech.
| A．that; where | B．where; that |
| C．where; where | D．that; that |
I don't think she ____what happens to her children.
| A．cares to | B．cares about |
| C．cares for | D．takes care of |
____ touch anything unless your teacher tells you to
| A．No | B．Not |
| C．Not to | D．Don't |