_____ I admit that there are problems, I don't' think that they cannot be solved.
| A．Unless | B．Until | C．As | D．While |
—I think the environment is becoming worse.
—Yes, I really don’t know we can do about it.
| A．which | B．whether |
| C．that | D．what |
I saw a boy in the supermarket yesterday, reminded me of my good friend.
| A．that | B．where |
| C．who | D．which |
—I saw Nancy on the way home yesterday.
—It be her. She’s gone to the USA for further study.
| A．mustn’t | B．can’t |
| C．won’t | D．needn’t |
he is well again, he can go on with his English study.
| A．Ever since | B．Even though |
| C．Now that | D．As though |
Medicine should be placed children’s reach to make sure of safety.
| A．with | B．within | C．out | D．beyond |