No one can imagine the difficulty hehad _______ his son to get rid of the habit of playing computer games

_________ by the beautiful scenery of the west Lake,the foreigners decided to spend another two days in Hangzhou.

He took it for granted that these local laws ________ the new comers like himself. [ ]

It was the training he had as a young man made him such a good engineer.

Many people believe that hunger is only a problem in the developing world. ______, it is a problem all over the world.