Choose the word or phrase (A, B, C or D) that best complete sentence

Choose the word or phrase (A, B, C or D) that best complet
sentence.
6. Today we learnt
A. what
to use the new machine.
B. why
how
D. who
your teeth.
B. for
C. on
7. Chocolate is not good
8.
CC
A at
do you go to the dentist?" "Twice a year."
A. How many Ⓑ. How often
9. "I have a toothache." -
C
Ⓐ⑩et's go and see a doctor.
C. How about filling your tooth?
"
C. When
3. No
D. with
D. What
B. Why don't you see a dentis
D. No problem.
10. May I have
A. one
sugar?
B. any
C. some
D. a
11. His idea is quite different
mine.
A. with
B. of
C. from
D. on
12. Students have two
each day.
A. 20-minute break
B. 20-minutes break
C. 20-minute breaks
D. 20-minutes breaks
B. to listen
13. Would you like _ to music?
A. listening
14.
don't you come to my house? - OK. Let's go
A. Why
C. when
D. What
B. Let's
15. Tam enjoys
soccer.
A. playing
B. to play
C. plays
D. play
C. listen
D. listens