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5. It's the
difficult exercise that they have ever done so far.
A. more
B. tooC. most
D. much
6. How
does it cost you to go to school by bus every month?
A. many
B. often
C. long
D. much
7. Uncle Mike
smoke cigarettes when he was young.
A. used to
B. isn't used to
C. wasn't used to
D. use to
8. I wish you
join the trip to Son Doong Cave with us next Sunday.
A. would
B. willC. be
D. can