we never get entirely knocked out of the game, hope always remains.

Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．

I’ m tired out. I ______ all afternoon and I don’t seem to have finished anything.

______ is no need for primary students to work attheir desks all the long.

There is no doubt that the Diaoyu Islands are _______part of China and what some Japanese have done recently is actually ________offence against Chinese people.