The streets here are not so ____ as those in our city.
| A．clear | B．clean | C．dirtier | D．longer |
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 |
Let me just ____ this and then I’ll go swimming with you.
| A．finish | B．to finish | C．finishing | D．finished |
Helen is 15 years old, and Joan is 15, too. So Helen is ____ Joan.
| A．as big as | B．as older as | C．as old as | D．so old as |