Stopping pouring polluted water into the river is _______ the factory has to solve at present.
A. what
B. that
C. why
D. which
It is obvious _______ on more important things.
A.which the money should we spend
B.what the money should we spend
C. that the money should we spend
D. that we should spend the money
Not until I shouted at the top of my voice _____ his head.
A.that he turned
B.did he turn
C.he didn’t turn
D.he had turned
Dew is formed _____ the grass is thick.
A.while
B.where
C.when
D.until
He wrote down the address _____ he should forget it.
A.in case not
B.lest
C.in order that
D.of fear that
No one knows exactly _______.
A.how speech began
B.how did speech begin
C.how the beginning of speech
D.of how beginning speech
Listening carefully to _______ in class means less work later.
A.what does the teacher say
B.what the teacher says
C. that the teacher says
D.which the teacher says
The professor and her achievement ______ you told me about are admired by us all.
A.who
B.which
C.that
D.whom
This is the shop ______ I often buy foodstuff.
A.where
B.which
C.of which
D.to which
The shop ______ I told you about before has closed down.
A.where
B.in which
C.at which
D.which