It is said that about half of the people in China smoke. Many young boys and girls have the habit of smoking, though they are middle school students. More and more people have come to realize how serious this problem is. But they are never bored with it. ① Some people think it is a kind of fashion, some think it is of great fun and others think that smoking can relax themselves. Smoking causes many illnesses. A lot of people always cough(咳嗽)②______ ______smoking. The most serious illness caused by smoking is lung cancer. At the same time smoking is a waste of money. Beside, careless smokers may cause dangerous fires. It’s known that smoking does harm to our health. We should get rid of(摆脱) the bad habit of smoking. 小题1:在②句空白处填上恰当的词使句意完整、上下文通顺：________  ________ 小题2:将①句译成中文: _______________________________________________________________ 小题3:回答问题：What’s the most serious illness caused by smoking? _______________________________________________________________________________ 小题4:在找出与下列句子意思相近的句子: We all know that smoking is bad for our health. _______________________________________________________________________________ 小题5:找出最能表达该短文主题的句子。 _______________________________________________________________________________