A. them
B. their
C. themselves
D. they
Đáp án: C
A. difficult
B. relevant
C. volunteer
D. interesting
A. currency
B. business
C. compulsory
D. puppet
A. to
B. for
C. with
D. of
A. frustrated
B. calm
C. confident
D. delighted
A. situation
B. shoes
C. feelings
D. heart
A. turned down
B. turned up
C. turned on
D. turned off
A. in
B. on
C. to
D. at
A. play
B. to play
C. playing
D. played
A. them
B. their
C. themselves
D. they
A. Unless
B. While
C. Since
D. Although