Step1. leading in

Have a free talk and then ask two students to talk about the pictures with the sentence What's it used for?"

　Step2. Listening practice

Show some flashes; listen carefully and match the years with the inventions.

　Step3. Pair work

Then ask students to make a conversation :

A: When was the computer invented ?

B: It was invented in.... .

A: What's it used for?

B: It is used for.......

　Step4. Listening

Have students listen to the conversation in 2d and fill in the following the blanks.

zipper Small ( )that changed the world 1.Think about how often it's used in our ( )life. 2.You can see zippers on dresses,trousers,shoes,bags almost( )! 3.The pioneers of different inventions( )( ) 4.It mentioned that the zipper( )( )by Whitcomb Judson in( ) 　Step5.Reading

What is the subject for their school project?