21.Peter insisted ----- he pay the bill.

21.Peter insisted _____ he pay the bill.
A.on that B.what C.that D.on which
22.They urged _____ the library open during the vacation.
A.when B.where C.why D.that
23.We wish we could have learned _____ when we were at high school.
A.what you did B.that you had done
C.that what you did D.what did you do
24.1 will describe to you _____ I saw when there.
A.what B.that C.which D./
25.From _____ I should say he is a good worker.
A.what 1 know of him B.that I do know of him
C.what do I know of him D.that do I know of him
26.I will give this dictionary to __ wants to have it.
A.whomever B.anyone C.whoever D.someone
27._____ they will come here hasn' t been decided yet.
A.What B.That C.When D.Where
28._____ was said here must be kept secret.
A.Who B.The thing C.Whatever D.Where
29.It is still a question _____ we shall have our sports meet.
A.if B.that C.what D.when
30.I'm going anyway._____ she will go is up to her to decide.
A.If or not B.Whether or not C.If D.That