2. Ask some questions about the inventions. For example, what do you think is the most helpful invention?

Step Ⅰ Revision

1. Check the homework by asking some children to read their conversations to the class.

2. Some bags of potato chips.

1. A tape recorder

2. Pairwork

1.Listening

Do the listening practice.

2. Teach the students to use the new vocabulary correctly.

1. Train the students’ reading, writing, speaking and listening skills with the target language.

3.Moral Objects

　you enjoy eating the potato chips?

　Have you ever thought of the history of the chips?