When I was doing shopping last Sunday, I ______ Mr. Smith in the street.

The duties of a policeman are _____ than ____ .

Could you please tell me you will go to HongKong on business—Sure. I prefer to take a plane.

. Jim has _______ friends here, so he often stays at home and feels lonely.

Over the past decades, sea ice _________ in the Arctic as a result of global warming.[ ]