The university estimates that living expenses for international students ______ around $8,450 a year, which ____ a burden for some of them.
A are；are               B. is；are                 C. is；is          D. are；is    

_____ of the students who took part in the military training is 1450.

A．A number

B．A lot

C．Lots

D．The number

Nowadays, a large number of women, especially those from the countryside, ____ in the clothes industry.

A．is working

B．works

C．work

D．worked

—He is the only one of the students ______from the country in my class, and we have known for quite some time.
—Where did you meet for the first time?     
—It was on the farm ________ I used to work.

A．who are; that

B．who is; where

C．that is; that

D．whom are; on which

______ the houses were knocked down in the earthquake.

A．A great many

B．The number of

C．A great many of

D．A great deal of

The majority of visitors ______ in favor of his conclusion that the number of books published on the subject ______ simply surprising.

A．were; was

B．was; was

C．were; were

D．was; were