Unit 2　In the lab

　　1.owledge: words and useful expressions
　　First of all, once, unless, cupboard electricity turn off, shut, by the side of, soap, taste, oil, mix, mixture, rather, finger, instead of, second (n) , on holiday, message, proper Allow, experiment, basin, finally, lively, sadly, request, Petrol, castor, vinegar, dip, suck
　　2. Moral Education: To get the students to do everything as carefully as they can.
　　3.Emotional Education:
　　To supply the students with a very harmonious atmosphere in order that they can have a successful understanding of the text and discussion.
　　Main Points: To let the students master and use freely some of the useful everyday English.
　　1. Here are some dos and don'ts.2. Follow the instructions.
　　3. What /How about when we leave?4. Make sure that ......
　　5. Do what he or she tells you to do.6. Please tidy the lab.
　　7. Could you please show me how to use the computer?
　　8. Don't touch anything.
　　Difficult Points:
　　1.To encourage the students to discuss and then ask them to demonstrate their ideas by using the imperative sentence structure.
　　2. To review and master the sentence structure of Direct and Indirect Speech.
　　3.once / unless / as连接的主从句