You’d better give up smoking, Tom, for many diseases are ________ to smoking, you know.[ ]

The five rings on the Olympic flag________the union of the five continents and the meeting of athletes from all over the world.

My grandfather was badly ill, so we asked him _________ smoking.

The reason ____ he was late for class was ____ he stayed up late last night.

The researchers who study jokes want to know peoplefrom different nations and cultures find funny