Books open, Look at Exercise, and read through the questions, make sure they can understand them.
Get the students to read the dates and numbers about.
Play the tape for the students to listen and check the answers;
1.A 2.B 3.A 4. B 5.C 6.A
Get the students to listen to the tape again, then read and repeat the sentences.
Listen to three dialogues, then repeat after the cassette. Get the students to practis the dialogues in pairs, then let them act it out in class.
Ask the students to do Exercise 3, Write down their answers in the table.
VII. Checkpoint 11
Go through Checkpoint 11. Revise the formation of the Passive Voice with “must/ should /can /may + past participle. Get the students to say some rules for the class using the structure, e. g.
1. English should be spoken everywhere at school.
2. Windows may be cleaned after class.
3. Teeth must be cleaned everyday.
Remind the students of the difference in the meaning of “must” (obligation) should (ought to) “can” and “may” (possible). Make sure the students can understand the meaning and the use of the useful expressions.
Let the students do Exercise 3 in the workbook.
Answers: 1. be grown, is grown, be harvested, be harvested
2. be dug, have finished, dig, be finished
Exercises in class
Rewrite the sentences in the Passive Voice.
1. You mustn't say dirty words to us.
2. We should water plants often.
3. Mary may put on her dress tomorrow.
4. They can climb that mountain.
5. Teacher should correct the homework.
6. You must keep the office clean.
1. Review the contents of Checkpoint 11.
2. Finish Exercises 4 and 5.
In developing countries people mostly use wood for cooking and heating. They cut down trees for fuel. But a tree cools the land under it and keeps the sun from smaller plants. As the leaves fall, they enrich the soil. When trees disappear, smaller plants die and only sand remains. Yet people need fuel, animals, and crops in order to live.
Men can take deserts, but they can also prevent them from getting bigger. Algeria(阿尔及利亚) is planting a green belt of trees along the edge of the Sahara Desert(撒哈沙漠) to stop the sand. In China, too, windbreaks(防风林带) are being built in the northwest to keep the desert from growing.
But deserts still threaten the world. Experts believe that land that is on the way to becoming