We can never expect ____ bluer sky unless we create _____less polluted world.
A. a; a B. a; the C. the; a D. the; the
Would you like tea or coffee?
--_____, thank you. I’ve just had some water.
A. Either B. Both C. Any D. Neither
In that school, English is compulsory for all students, but French and Russian are ______.
A. special B. regional C. optional D. original
Sometimes proper answers are not far to seek ______ food safety problems.
A. in B. to C. on D. after
To get a better grade, you should ______ the notes again before the test.
A. go over B. get over
C. turn over D. take over
I ______ through that bitter period without your generous help.
A. couldn’t have gone B. didn’t go
C. wouldn’t go D. hadn’t gone
