If I felt some pain, I would stop _________.
| A．exercise | B．to exercise |
| C．exercising | D．exercises |
He feels lonely because he has no close friends ____.
| A．to talk | B．to talk with | C．talking | D．talking with |
If you are ____ trouble, please call me ____ 72335611.
| A．in; in | B．at; at | C．at; in | D．in; at |
When the teacher asks him, he always ____.
| A．keep silent | B．keep silently | C．keeps silent | D．keeps silenty |
Mr. Li makes me ____, because it is bad for my health.
| A．don’t smoke | B．not smoke | C．not smoking | D．not to smoke |
Tom didn’t go hiking with his classmates ____ his illness.
| A．because | B．because of | C．as | D．since |