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【題目】Shenzhou I, ________ many of you are old enough to remember, was launched in November, 1999.
A.what
B.that
C.as
D.one

【題目】You should keep in mind ________ you should behave while travelling abroad.
A.that
B.what
C.how
D.where

A. masked B. will have masked

C. have been masked D. have been masking

【題目】We still have the question of ________ they have discovered the trade secret.
A.what
B.why
C.how
D.that

【題目】________ bothers me is that the young man seems to know a bit too much.
A.Whether
B.What
C.Which
D.That