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1.自编对话进行表演。
2.写一份环保倡议书。
教学过程：
Step 1 Greetings
Step 2 Lead-in
Free talk
Watch the PPT
揭示课题：Keep our city clean
Step 3 Presentation and practice
1.Help the birds
（1）Know what makes our city dirty.
（2）Know what can we do to keep our city clean.
（3）Write a proposal to allow more people join us.
2.Watch and answer: Is the city clean?
3.Self-Study:What makes the city dirty?
4.Group-Study
(1)Help each other
(2) Ask the teacher
(3)Prepare to report
5.Fill in the form
6.Listen and answer:What can they do to keep the city clean?
7.Discuss in groups:What can you do to keep our city clean?
8.Listen and repeat.
9.Happy reading.
10.Showing time.
Step4.Consolidation
Make a dialogue.
Watch a video.
Write a proposal.
Song time.