Indentify the one underlined word or phrase that must be changed in order for the sentence to be correct.

Imagine anentirely wireless world where

the Net is always on, always there, we live in

endless sea of data, and objects are alive with intelligent

A. improving   

B. making                   

C. saving                                

D. employing

A. into             

B. up to                       

C. out of                                 

D. away from

A. up to now, we have designed some solar cars.

B. solar cars have been very popular for many years.

C. we have not produced any solar cars yet.

D. solar cars are not as much appreciated as other kinds of car.

A. powerful    

B. medical      

C. dangerous   

D. computer

A. assist

B. increase      

C. make         

D. create

A. Cancers and AIDS, which are untreatable now, will be cured successfully.

B. Cancers and AIDS, they are untreatable now, will be cured successfully.

C. Cancers and AIDS, that are untreatable now, will be cured successfully.

D. Cancers and AIDS, which are untreatable now, they will be cured successfully.

A. communication                  

B. education                

C. medicine                             

D. technology