13. Our bad living habits will destroy the earth. Only by changing ________we live can we save the earth.
A. that
B. what
C. how
D. where
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14. Thinking that you know _________ in fact you don’t is a serious mistake
A. what
B. that
C. when
D. however
15. Energy is _________ makes things work.
A. what
B. everything
C. something
D. anything
16. One of the men held the view __________the book said was right.
A. that what
B. what that
C. that
D. whether
17. I think that this meal was well worth ________ was charged for it.
A. that
B. what
C. which
D. how many
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