. Some animals are in danger, and the scientists are doing ___ they can ___ them.
| A．that; to save | B．whatever; to save | C．what; save | D．the thing; save |
—Which one of these two dictionaries do you advise me to buy, Oxford or Longman?
—Well, take Oxford. I think it is the ________ of the two.
| A．best | B．better |
| C．good | D．well |
Nothing that you say can change his mind, ________？
| A．do you | B．don't you |
| C．can it | D．can't it |
The smoggy weather has made us realize ________ terrible problems we are faced with.
| A．how | B．what |
| C．that | D．which |
—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is ________ is troubling him.
| A．what | B．which |
| C．as | D．that |
When the millionaire was young, he was very poor. Only by doing parttime jobs during the summer holiday ________ afford to pay his college fees.
| A．he could | B．could he |
| C．can he | D．he can |