With the population explosion,scientists will have to ____ n

With the population explosion,scientists will have to ____ new.
11.With the population explosion,scientists will have to ____ new methods of increasing the world’s food supply.
A.lead to B.carry out C.come up with D.stick to
12.The police are _____ the mysterious disappearance of a two-year-old girl from her home in Florida.
A.found out B.handling C.study D.looking into
13.________ you keep trying,you’ll certainly succeed.
A.So B.Because C.As long as D.No matter how
14.The judge ______the truth of the evidence provided by the witness.
A.guessed B.suspected C.thought D.realized
15.Smoking is _____ in the office.
A.no good B.discouraged C.encouraged D.prohibited
16.Linda can ____ read and write though he has recently graduated from high school.
A.seldom B.undoubtedly C.perfectly D.barely
17.I suggest that you _____ these lessons before you take the final exam.
A.go across B.review C.go up D.go on
18.It is more difficult for the Smiths to____ money now because of the high rate of inflation.
A.set down B.set about C.save D.set up
19.Chichester ________ all kinds of hardships in his solo sailing round the world.
A.endured B.overcame C.know D.lasted
20.Are you _____ that the boy you saw in the hotel corridor was Peter?
A.right B.wrong C.positive D.doubtful

B
D
C
B
B
C
B
C