He is famous _____the field of biology, but he is more known _____an environmentalist..
| A．for, for | B．in, for | C．in, as | D．in, as |
It is required that the students _____ mobile phones in their school, so seldom _____ them using one.
| A．should not use; you will see |
| B．mustn’t use; will you see |
| C．not use; you will see |
| D．not use; will you see |
Nuclear ______ be really dangerous at times even though it’s a nice energy in general.
| A．shall | B．should | C．can | D．Must |
When reading English novels, I often idiomatic expressions that I can't understand．
| A．come across | B．go over |
| C．get across | D．take over |
Hardly _when they realized that it was too late to catch the last train．
| A．the clock had struck twelve |
| B．the clock had been struck twelve |
| C．had the clock been struck twelve |
| D．had the clock struck twelve |
The Obama government has reformed on tax system.What people doubt is ______ it will do them any good．
| A．that | B．whether | C．why | D．What |