________ in a recent science competition, the three students were awarded scholarships totaling $ 21, 000.

A. To be judged the best　　　　　　 B. Judged the best

C. Having judged the best　　　　　 D. Judging the best

—Why weren’t you at the meeting?

—I ________ for a long-distance call from my aunt in America.

A. waited B. was waiting C. had been waiting         D. had waited

They won’t buy any new clothes because they ________ money to buy a new car.

A. save     B. were saving    C. have saved  D. are saving

Speaking of all the songs he has written, I think this is probably his ________ one.

A. better-known       B. well-known  C. best-known D. most-known

With online course Crazy English has over 20 million students all over China          the class through the Internet .

   A. attend                    B. attended               C. attending              D. to be attending

.  What is the way George thought of      enough money to buy the house?

   A. to get                     B. getting                  C. having got            D. being got

You don’t have to know the name of the author to find a book. You______find the book by the title.

A. must        B. need      C. can       D. would

Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it.

A. to see           B. to be seen           C. seeing                D. seen

His letter was so confusing that I could hardly make any ______ of it.

A. explanation B. meaning   C. sense  D. guess

Is oxygen the only gas _______ helps fire burn?

A. that      B. /     C. which   D. it