A.Mĩ.
B.Đức.
C.Anh.
D.Pháp.

A.by the time we find
B.after we had found
C.when we found
D.as soon as we had found

A.2,0.
B.1,0.
C.1,5.
D.2,2.

A.Benzen.
B.Etilen.
C.Axetilen.
D.Metan.

A.Fe.
B.Cr.
C.Na.
D.Li.

A.2
B.4
C.1
D.3

A.4
B.3
C.2
D.1

A.Glucozơ.
B.Etyl axetat.
C.Gly-Ala.
D.Saccarozơ.

A.Ag.
B.Cu.
C.Fe.
D.Mg.

A.metyl axetat.
B.metyl propionat .
C.etyl axetat.
D.propyl fomat.