Sally was a bit shy, but we found her quite ____ discussing recent singing stars with others.

A. at home                   B. at a loss                   C. in public                  D. in common

A recent report found that women graduates are more likely than non-graduates ____ childless throughout their lives.    

A. remained          B. to be remained          C. remain                     D. to remain

The Turners consider ____ a computer, which is commonly considered ____ a great help in our work and study.

A. to buy; to be            B. buying; to be            C. to guy; being            D. buying; being

---- What about the two MP3s?  

---- Sorry, but I don’t like _____ of them. Would you please show me a third one?

A. none                       B. either                      C. both                        D. all

It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.

A. a; a                  B. a; /                          C. /; a                          D. /; /

My bicycle is nowhere to be found. Who ___ have been using it?

  A. should               B. must                       C. could                      D. might

He cut off the electricity immediately he found the dangerous situation, thus ____ a fire accident.

A. prevented         B. to prevent                C. would prevent          D. preventing

But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.

A. as with                    B. as for                             C. as to                       D. as when

They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.

A. which; that              B. it; one                      C. that; one                  D. one; that

They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.

A. waving and moving       B. waved and moved

C. waved and moving        D. waving and moved