The sun always sets early in winter. 2. Some plateaus, like Tibet, are very high and cold. 3. It has rained everyday so far this month. 4. Is Asia in the Northern Hemisphere? 5. She presented each guest some small cakes. 6. The population in the world is increasing rapidly. 7. I want to talk to you today. 8. How long have you studied here? 9. Professor Smith will give the students a lecture on American culture this evening. 10. Explain the new words and expressions in English, please. 11. To learn English well is no easy matter. 12. Do you mind my opening the back door? 13. Such an arrangement won’t make him satisfied. 14. People elected him the representative of the district. 15. Could you tell me the way to the railway station? 16. Radar can help airplanes land safely. 17. Electronics has made possible a new kind of higher education and research. 18. How many English dictionaries do you have? 19. We found everything in the room in good order. 20. They painted their house white. 21. American Country music became popular in America during the 1990s. 22. We often speak English in class. 23. Two-thirds of the students in our class are boys. 24. Smoking does harm to the health. 25. When we are going to have a math test has not been decided. 26. It is necessary to master a foreign language. 27. His hobby (爱好) is playing football. 28. He is playing football. 29. The machine must be out of order. 30. class is over.