She was unhappy that she lost contact with a lot of her old friends when she went abroad to study.

A. stand                          

B. understand                        

C. write             

D. interrupt

A. including                 

B. limiting                        

C. especially           

D. possibly

A. It seems to flourish in the presence of certain pollutants.

B. It has been a menace to fish and humans for over 3000 years.

C. It is the oldest life form on earth.

D. In large concentrations, it poses a threat to fish but not to humans.

A. civilian                      

B. official                     

C. temporary              

D. tsunami

A. came on to                    

B. came away from        

C. came out of             

D. came up to

A. vanishing                    

B. damaging                  

C. polluting                

D. destroying

A. trained                       

B. proved                  

C. impressed                

D. performed