A.0,16 mol.
B.0,18 mol.
C.0,19 mol.
D.0,21 mol.

A.1,1 và 27,7.
B.3,3 và 27,7.
C.3,3 và 24,5.
D.1,1 và 24,5.

A.5
B.2
C.3
D.4

A.do they
B.are they
C.have they
D.had they

A.do they
B.are they
C.have they
D.had they

A.favour
B.priority
C.preference
D.liking

A.taking
B.causing
C.making
D.doing

A.took after
B.made up
C.turned down
D.came across

A.were enjoying
B.enjoyed
C.had enjoyed
D.had been enjoying

A.by the time we got home
B.as soon as we were getting home
C.when we get home
D.until we had been getting home