--- It’s the office! So you ______ know smoking is not allowed here.
--- Oh, sorry.
| A．must | B．will | C．may | D．Need |
________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
| A．That; how | B．Which; what |
| C．What; what | D．What; how |
________ you are supposed to do ________ you don't like a thing is change it. Don't complain.
| A．That; why | B．What; when |
| C．What; where | D．That; how |
His younger sister may already be in high school now, in ________ case this picture book is too childish for her.
| A．that | B．which |
| C．whose | D．what |
It is by no means clear ________ the president can do something to end the strike.
| A．whether | B．which |
| C．that | D．what |
Good shoes, clothes and a backpack are the basic ________ you need for your hiking.
| A．equipment | B．instruments |
| C．tools | D．models |