_________, and you will be healthier.
| A．Keep exercise | B．Keeping exercising |
| C．Keep exercising | D．Keeping exercise |
We are so tired(累) these days because we have ________ homework .
| A．too much | B．too many |
| C．lot of | D．a lots of |
—Why do you like dogs?
—________ they are very friendly.
| A．So | B．But |
| C．Because | D．And |
My class teacher is very good _____ us, and we love her very much.
| A．for | B．with | C．at | D．in |
The boy is afraid ______ his mother because she is very strict _____ him.
| A．at; with | B．about; in |
| C．of; with | D．with; of |
—_______ she like math?
—Yes, she likes it very much. She thinks it’s interesting and easy for her.
| A．Is | B．Does | C．Are | D．Do |