_______we are worried about is that air pollution is becoming much heavier in Han Dan.
| A．It | B．What | C．Why | D．Which |
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 |
I want to show you is my gratitude and respect for your continuous and selfless help.
| A．That | B．Which | C．Whether | D．What |
_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.
| A．What | B．It | C．As | D．Which |
Life is like a tale. ________ matters is not how long it is, but how good it is.
| A．Which | B．That | C．What | D．Whose |
________ fails to realize the importance of improving the learning strategies will have great difficulty in learning.
| A．Who | B．Whoever | C．What | D．Whatever |
She told me that ______ was needed at that time was some good luck.
| A．it | B．what | C．this | D．as |
______ he can hardly read is ____________ he is slow in mind.
| A．what; that | B．That; what | C．What; because | D．That; because |
It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
| A．that; while | B．what; while | C．that; as | D．what; as |
. most parents care about is to provide the best education for their children.
| A．What | B．That | C．How | D．Whether |
The job required did it careful and brave enough.
| A．who; is | B．whom; was | C．whomever; were | D．whoever; be |
It is well known ___ a person eats causes changes in the body.
| A．what | B．that what | C．what that | D．that |
As is known to all, Yang Liwei has become a space hero is we have expected．
| A．that; which | B．what; that | C．what; which | D．that; what |
________ is known to us all is that the old worker, for _______ life was hard in the past, still works hard in his seventies.
| A．As; whom | B．What; whose | C．It; whose | D．What; whom |
________ you ought to do now is to see a doctor at once.
| A．How | B．That | C．Which | D．What |
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