11.The tsunami(海嘯) (　　)over 160,000 people were killed was a terrible disaster for human beings.

　　A.of that

　　B.among which

　　C.during that

　　D.in which

　　12.These three teachers vary (　　)their manner of teaching.

　　A.between

　　B.from

　　C.with

　　D.in

　　13.Since there isn't much time left, you can just tell us bout it (　　).

　　A.in detail

　　B.in short

　　C.in all

　　D.in brief

　　14.I (　　)my wallet when I was shopping in the store.

　　A.must have dropped

　　B.should have dropped

　　C.could drop

　　D.ought to have dropped

　　15.She (　　)be ill because I saw her playing tennis just now.

　　A.can't

　　B.couldn't

　　C.mustn't

　　D.may not

　　16.Since he left the university, he (　　) in an accounting company.

　　A.has been working

　　B.had worked

　　C.had been working

　　D.was working

　　17.To succeed in a scientific experiment, (　　).

　　A.one needs being patient person

　　B.patience is to need

　　C.one needs to be patient

　　D.patience is what needed

　　18.He asked her to go to a concert with him but she (　　)his invitation politely.

　　A.turned ; down

　　B. turned ; out

　　C. turned ; away

　　D. turned ; up

　　19.The doctor's advice was that the patient (　　)at once.

　　A.to be operated

　　B.being operated

　　C.be operated

　　D.operated

　　20.It was not until dawn (　　)their way out of the forest.

　　A.when they found

　　B.that they found

　　C.did they find

　　D.that they didn't find