【题目】—It's a long time ________ I saw you last.
—Yes，and what a pity！It will be a long time ________ we see each other again.
A.since; before
B.when; when
C.since; when
D.before; since

— ! Would you like to go with me?

A. You bet. B. You know better C. You got me D. You there

【题目】That raised the costs of Medicare, ______ represented 15% of the federal funds last year.
A.it
B.what
C.which
D.that

A. a black sheep B. a dark horse C. a green hand D. a wet blanket

【题目】What worried her a bit is ______ her hair was turning grey.
A.whether
B.if
C.what
D.that

【题目】He said nothing except ________ he will come to her birthday party.
A.that
B.what
C.whether
D.if

【题目】— Would you like to do it at all?
— I'd love to, but the question is _____it is worth doing.
A.if
B.whether
C.when
D.that