30. Our physics teacher told us light _________ faster than sound last term.

A. travels    B. travel   C. traveled   D. traveling

I′ m writing to you because it′s too difficult to talk about it. I can′t stop thinking about my uncle and how he 31 . In fact, I seriously want to ask you 32 smoking. I ′ve looked up a lot of information about smoking and I 33 out some disturbing things.

You already know that 34 is bad for your breathing and can cause caner. I ′ ve learnt that it causes many other illnesses 35 . Did you know that over 100,000 people die from smoking every year in Britain? It′ s 36 cause of death in the world. I don′t want you to be one of those people.

When Mum asks you to smoke 37 , you think she′ s annoyed. Well, it′s true that she doesn′t like the smell of smoke in the house and on our clothes. It′s not very pleasant.

38 ,when you smoke , it′ s also bad for me and Mum. In 39 words, when we breathe in your smoke , it′ s like we′ re smoking 40 . As a result, we can also get diseases. Doctors are finding that more and more non-smokers are falling ill 41 the effects of other people′ s smoking.

I know that it′ s very difficult to stop smoking but you mustn′ t 42 to it. Please see the doctor and ask him for help. We will do anything we can 43 you. You must try to save your own life. You are important 44 us and we don′ t want to lose you. Who else can I ask to help me with my maths homework or 45 my bike? Please don′ t smoke!
                                           Your loving daughter,
                                                       Kate