The little boy is but he can speak Chinese.

The question is not easy and only _______ students can answer it.

nown to all is that Beijing and Zhangjiakou have been trying to co-host the 2022 Winter Olympic Games on Nov 3, 2013.

Air pollution has become__________ than ever before. We must do something to stop it.

Health is not valued till sickness comes，so it is time that we more consideration to our health in today’s fast-paced modern world.