Seeing their teacher _______ into the classroom, they stopped _______ at once.
| A．walk; telling | B．entering; to speak |
| C．enter; to tell | D．walking; talking |
The number of visitors _______ smaller and smaller because of the worse environment here.
| A．become | B．are becoming |
| C．is becoming | D．have become |
My mouth was watering ______I watched A Bite of China.
| A．when | B．before | C．since | D．after |
I haven’t heard ________ Jim yet for a long time.
| A．of | B．from | C．about | D．with |
______I got up early this morning, I couldn't catch the early bus.
| A．When | B．Although | C．Because | D．If |
The environment in our city ____ greatly if we make every effort in the near future.
| A．improved | B．was improved |
| C．has improved | D．will be improved |