The reason _________ the little actress has been such a success is ________ she is both clever and hardworking.
A. why; that
B. why; why
C. that; because
D. for; because
I have no idea _______ we can do with these waste materials.
A. that
B. what
C. whether
D. if
FBI stands _________ Federal Bureau of Investigation.
A. in
B. by
C. for
D. with
His work _________ have been completed; otherwise, he wouldn't be enjoying himself on the beach.
A. should
B. must
C. can't
D. shouldn't
He wondered __________ the pyramids were built.
A. what
B. that
C. if
D. how
He insisted that he __________ and that he ________ nothing wrong.
A. be set free; should do
B. set free; should do
C. should set free; had done
D. be set free; had done