It worried her a bit ________her hair was turning gray.
| A．while | B．if |
| C．that | D．for |
It remains to be seen________North Korea will remain stable under its new young leader.
| A．when | B．whether |
| C．why | D．That |
The limits of a person’s intelligence, generally speaking ,are fixed at birth, but he reaches these limits will depend on his environment.
| A．where | B．whether | C．that | D．why |
______ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.
| A．What; how | B．That; how | C．That; what | D．What; what a |
______ is reported in the newspaper is that seventeen climbers have been killed in the snow tsunami.
| A．It | B．As | C．What | D．That |
_____ we can’t get seems better than _____ we have.
| A．What, what | B．What, that | C．That, that | D．That, what |
___ we have overlooked, however, is that there is no one answer to this question．
| A．Which | B．That | C．Where | D．What |
（）the delayed flight will take off depends much on the weather.
| A． | Why | B． | When | C． | That | D． | What |
I think _______ impresses me about his painting is the colours he uses.
| A．what | B．that | C．which | D．who |
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
| A．whether | B．why | C．when | D．how |
_____ I cannot understand is _____ she wants to resign her present job.
| A．What; why | B．Which; how | C．That; why | D．What; which |
---Tell me something about your adventure in the rainforest, please.
---We lost our way in the forest and ___ made matters worse was ___ night began to fall.
| A．what; that | B．it; that | C．it; because | D．what; because |
7．Perhaps it will never be known __________ he did with those materials on the incident．
| A．that | B．what | C．which | D．how |
It is by no means clear the president can do to end the strike.
| A．how | B．which |
| C．that | D．what |
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