257＋299=____

1940－1762=____

    In our daily life, some people think that smoking1help them relax. In fact, smoking is really2 Do you know that there are over 4,000 chemicals（化学药品） in cigarettes? These chemicals are 3for our bodies. They can cause cancer and 4diseases.

    The smoke from cigarettes harms not only smokers but also other people. It's5“second-hand smoke” and it can be6and has higher risks. Smokers shouldn't use smoking7them relax. They must give up smoking as soon as possible.