Jim______        sing Chinese songs very well now, but he______do it last year.

A. can; can’t B. could; can’t C. can; couldn’t D. could; couldn’t

— 　　　 I smoke here, Sir?

— No, you 　　　. Look! It’s non-smoking area.

A. Can; needn’t   B. May; mustn’t    C. Could; won’t  

写作训练

假设你是小明，将有一名美国的中学生Tom来你家做客，并住上两天，请你向这位首次来中国访问的外国客人介绍一些中国的日常礼仪。（如：见面礼，餐桌礼仪等等。）

参考句型： We are supposed to…/ We are not supposed to      We should / shouldn’t…

38It’s polite/ rude to… We are allowed to…/ We aren’t allowed to…We can/ could/ can’t/ couldn’t…

Do you have a mobile phone? Do you send text messages to your friends and family?
Text messaging or “texting” is becoming very p__1__. But scientists have p__2__ that texting can give us problems with our h__3__. Be careful! Too much texting can cause RSI (Repetitive Strain Injury) in our thumbs (大拇指) and wrists (腕关节). We spoke to a doctor called Harriet Wilson, who treats many patients with RSI. She says if we spend more than 10-15 minutes texting each time, we could have p__4__ in the future.
Dr. Harjeet Deepa, who treats RSI patients, said that the y__5__ patient she had treated was a 5-year-old girl. She had s__6__ bad RSI in her hands that she couldn’t hold a pencil.
As mobile phones d__7__, they are getting smaller with buttons c__8__ together. Texting with a smaller phone is worse than using a larger phone with b__9__ buttons. Using computers and playing video games can cause the same problem. So more and more people could find t__10_ with RSI.
Many university students and teenagers have RSI. If we don’t do anything about this, too many young people could grow up in terrible pain.