11.The doctor said that I had to eliminate alcohol.

A.cut out

B.cut on

C.cut in

D.cut up

12.The class of mammals embraces nearly all warm-blooded animals except the birds.

A.takes on

B.takes over

C.takes in

D.takes up

13.The environmentalists advocated better protection of the earth.

A.appeal

B.pledge

C.proclaim

D.urge

14.We can utilize water for producing electric power.

A.employ

B.embrace

C.emerge

D.emphasize

15.Your reasons for refusing to help are quite vague.

A.obvious

B.typical

C.imprecise

D.unreasonable

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