Diligence is ______ it takes for the post-90's generation to win competitions.
| A．what | B．where | C．which | D．when |
The only existing problem is ____ we can find this special wood in the forest in such a short time.
| A．when | B．where | C．that | D．whether |
The reason why they failed the test was ____ they didn’t sleep at all the night before.
| A．because | B．why | C．that | D．for which |
The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
| A．that; what | B．which; that | C．what; what | D．which; that |
_______ puzzled Li Lei a lot was _______ his best friends didn’t come to school this morning．
| A．That; why | B．That; what | C．What; whether | D．What; why |
____ is known to all is ____ Diaoyu Island is part of China.
| A．What; that. | B．It; that. | C．As; that. | D．What; what. |
The reason _____he was absent was _____ he was ill and unable to go to school.
| A．which; that | B．why; because | C．which; because | D．why; that |
_______ is expected, according to the online survey, is _______ the price of housing will not go up any more.
| A．As; what | B．It; that | C．What; that | D．What; which |
What is even more important is_____ the earth cooled down, water began to appear on its surface.
| A．that | B．that as | C．which | D．which as |
Another reason _____ he didn’t mention is _____ the poor quality of the buildings worsened the damage.
| A．why; because | B．for which; that | C．that; that | D．which; because |
The reason ______ he didn’t come was ______ he was injured.
| A．that; because | B．why; that | C．why; because | D．that; that |
What is concerning us greatly is ____ the workers held up in that area yesterday will be set free.
| A．that | B．what | C．when | D．which |
________ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.
| A．What; how | B．That; how | C．What; what a | D．That; what |
—How come you are always staring at me this morning?
—You look stupid! The way you wear is________ annoys me most.
| A．which | B．where | C．how | D．what |
The reason I have to go is my mother is ill in bed.
| A．why...why | B．why...because |
| C．that...because | D．why...that |
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