Every four years athletes from all over the world _____the Olympic Games .

The manager asked me whether I _______ good at computer science.

On the top of the mountain, you can get a wonderful ______ of the nearby hills. This is the very reason _______we like to go there in our spare time.

_____, the book will surely attract readers’ attention since it is related to people’s health.

He________go to bed_______he finished his homework.