Science and technology have ____in important ways to the improvement of agricultural production.

A.     attached  B. assisted  C. contributed  D. witnessed

We congratulated him ______ his getting a gold medal.That is to say: we offered him our congratulations ______ his getting a gold medal.

A.at;on                         B.of;on                        C.on;for                       D.on;on

—Will you be able to finish your report today?

—_______.

A. I like it      B. I hope so      C. I’ll do so       D. I’d love it

He ________ a long pole in the center of the field, and on the top of it I hung the lamp.

A. put up                    B. put out             C. put on               D. put up with

American women were _____ the right to vote until 1920 after many years of hard struggle.

        A. ignored      B. refused       C. neglected      D. denied

About 60 percent of the students ________ from the south,the rest of them ________ from the north and foreign countries.

A. are;is         B.are;are        C.is;are                        D.is;is

But for the help of my English teacher, I ____  the first prize in the English Writing Competition. 

A. would not win          B. would not have won   C. would win    D. would have won

Hiking by oneself can be fun and good for health. It may also be good for ______ building.

A. respect       B. friendship        C. reputation        D. character

Quite a few employees’ payments are cut down and barely cover their household ________ due to the serious economic crisis.

 A. bills    B. expenses     C. prices    D. charges

In dealing with public relations, we should make every effort to prevent the______ in personality.

A. contact                  B. contrast                 C. connection                    D. conflict