A.in spite of
B.on account of
C.in addition to
D.even though

A.are playing
B.were playing
C.played
D.had played

A.nice red silk
B.red nice silk
C.silk nice red
D.silk red nice

A.The more hard
B.The hard
C.The harder
D.The hardest

A.with
B.for
C.at
D.about

A.was cleaned
B.cleaned
C.cleaning
D.clean

A.don’t they
B.do they
C.does he
D.doesn’t he

A.0,3 nm.
B.350 nm.
C.300 nm.
D.360 nm.

A.NH3.
B.H2SO4 đặc nguội.
C.MgCl2.
D.NaOH.

A.25,96.
B.24,36.
C.23,32.
D.26,42.