Public attention at the moment is ______ on the problem of how to create opportunities for the laid-off workers

(2013·浙江，18) If what your friend comes up with surprises you，don’t reject it immediately________，imagine that it is true

Why are the housing prices in big cities going up all the time?-One reason is that people are________ into overcrowded cities in great numbers.[ ]

There is no doubt ______ he will pass the final exam, for he is always working hard.

My friend has achieved his goal after years of hard work.— Great! ______.