(1)----- important ------ some exercise every day.

(1)_____ important ______ some exercise every day.
A.That's;to do
B.It's;do
C.That's;do
D.It's;to do
(2)A child asks all kinds of _______ while he is growing up.
A.troubles
B.matters
C.problems
D.questions
(3)His grandmother is very healthy bacause she often ______.
A.exercises
B.smokes
C.sleeps
D.sings
(4)He ______ know the answer,but I'm not sure.
A.maybe
B.may be
C.may
D.must
(5)He works very hard every night,he doesn't go to bed ______ eleven o'clock.
A.after
B.until
C.since
D.in
(6)--Can Peter go with us?
--No,his mother wants him _____ at home today.
A.stays
B.stayed
C.to keep
D.keep
(7)We are in _____ class.
A.same
B.the same
C.different
D.the different
(8)--Why don't you try the Sichuan food?
--I can't stand the pepper.I want to ______.
A.keep good health
B.kepp in good healthy
C.keep health
D.keep healthy