Maybe if I ________ science，and not literature then，I would be able to give you more help.(2011·北京)

Each player of chess is trying to trap the other player’s king into a position _________escape is impossible

I shall never forget those years _______ I lived in the country with the farmers, ______ has a great effect on my life.

Where did you find the group of children? — It was in the woods ______ they played hide-and-seek. [ ]

was younger, I’d often go for ________ drivewith some friends, purely for ________ enjoyment of it