教学目标 
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 donts.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. Dont 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

教学建议

Since the dialogue and the text of this unit are about chemistry, the teacher may ask some questions about chemistry or other subjects to lead in the dialogue and then show the students the tolls that are used in the chemistry lab when the text is taught.
And also in order to make the class very lively and interesting the teacher may borrow the tubes which are filled with three kinds of liquids from the chemistry lab and ask them to guess whats in the tubes and then ask them to watch the teacher carefully then do what the teacher .
Does, which is the content of the text. In this case the students may feel very new and they may be interested in English class.
In order not to cause something dangerous to happen, the teacher may fill some white vinegar（白醋, some cooking oil(香油),some alcohol(白酒) in the tubes.
重点词汇讲解
1. first of all means first. 意为首先，第一
First of all, I want to say Im very happy to be here with You.
First of all, we must make a decision.
相关的词组：at first which is opposite to at last for the first time 第一次
2．allow 的用法
allow + noun.
allow sb. to do / not to do sth../sb. is allowed to do
allow +doing
(1) He allowed no noise here.
(2) He allowed his boy to spend the weekend with his friends.
(3) Why did you allow her to smoke here?
(4) We dont allow drinking at school.
3. once 是连词，作“ 一旦……就……”讲。
(1) Once she arrives, we can start.
(2) Once you realize it, you will study hard.
(3) Once seen, it can never be forgotten.只要见过一次就难以忘怀。
注意once 一般和现在时连用。
4.unless是连词，相当于if …… not ……
(1) He will not come unless his homework is finished. ==He will come if his homework is finished.

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