Some don’t agree to the plan, while I’m out of ____ opposed to it.
| A．those who | B．who | C．those | D．that |
Mr. Smith was so angry at all ______ Bill was doing ______ he left.
| A．that; what | B．that; that | C．which; which | D．what; that |
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 |