The parents have devoted themselves to bringing up their children and now it is time for the children, ______, to show their devotion to their parents.[ ]

Michael ________ football regularly for manyyears when he was young.

The sudden death of Kim Jong-il(金正日) had a short-term effect on Asian trade, _______the dropping of stocks（股票） in some Asian countries.

______ you do the experiment carefully, you would make discoveries others wouldn’t make.

What if you have two days_______——I’d like to go_______ a trip_______ Suzhou.