We must do everything we can _________ our earth clearer and safer.
| A．made | B．to making | C．make | D．to make |
—Do you like swimming?
—Yes, swimming is a good way _______ fit.
| A．keep | B．to keep | C．keeping | D．keeps |
She got up early this morning _________ she could catch the first bus.
| A．because | B．so that |
| C．in order to | D．when |
This year our school is __________ than it was last year.
| A．much more beautiful | B．much beautiful |
| C．the most beautiful | D．beautiful |
One of the suspects is ____ schoolboy.
| A．an 18-year- old | B．an 18-years-old |
| C．a 18 years old | D．a 18-year-old |
---May I go home right now?
---No, you____. You must finish your work first.
| A．don’t | B．can’t |
| C．needn’t | D．mustn’t |