An unhappy childhood may have some negative effects on a person’s characters; however, they are not always_________,

Microblog（微博）        with so many people is sure to influence our society..

It is most ________that the experts will come to the area to investigate the possible damage caused by the heavy flood.

Can you believe that in ___ a rich country should be ___ many poor people?

Attention, please! And keep ________ when I am taking a photograph of you.