--Psychologists think it's bad tobecause thinking too much about oneself may cause depression.
--It seems that it is possible to cure depression by focusing on other people.
A. pay attention to
B. be paid more attention
C. be paid more attention to
--The world's population is getting larger and larger. It's a serious problem.
--Yes. Scientists will have tonew waysfood problem.
A. think of, to solve
B. think over, of solve
C. think about, about solving
--I know not lung about the history of the telephone. Could you tell me?
--Yes. In 1876.
A. when the telephone invited
B. who invented the telephone
C. when the telephone was invented