A.routine actions
B.a person's immediate situation
C.itself
D.appropriate relationships

A.drag
B.consume
C.question
D.celebrate

A.new invention
B.a solution to a problem
C.a way to act in a relationship
D.a job that needs close attention

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