A.train
B.line
C.chain
D.series

A.NaNO3.
B.NaOH.
C.MgCl2.
D.KCl.

A.Na2CO3.
B.Mg(NO3)2.
C.HCl.
D.NaNO3.

A.CH3OH.
B.C3H7OH.
C.C2H5OH.
D.C3H5OH.

A.for my use
B.at my disposal
C.for me use
D.at my use

A.encourage
B.congratulate
C.respect
D.welcome

A.out of
B.under
C.over
D.behind

A.cats and dogs
B.chalk and cheese
C.salt and pepper
D.here and there

A.a flag
B.a leaf
C.jelly
D.the wind

A.wall
B.fence
C.verge
D.bridge