21. We can never expect ______ bluer sky unless we stop ______ industrial waste going into _____ atmosphere.
A. a; the; the B. the; the; the C. a; /; the D. the; /; /
22. Because of the bad management, this restaurant was not _______ it was 10 years ago.
A. half as good as what B. as half good as that
C. as good as half what D. half as good as that
