The reason he made such kind of mistakes is that he has had no _______ experience of this kind of job.
| A．whether; previous | B．which; before | C．why; previous | D．that; before |
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |
____ matters most in learning English is enough practice.
| A．What | B．Why | C．Where | D．Which |
Engines are to machines _________ hearts are to animals.
| A．as | B．that | C．what | D．which |
____ team wins on Saturday will go through to the national championships.
A. No matter what B. No matter whichC Whatever D. whichever