33. Nam got wet because he forgot his umbrella
34. That's very kind of you.
35. Solar energy can be cheap and clean.
36. I look forward to hearing from you.
31. Because Mr.Phong didn't feel well, he didn't go to work yesterday.
32. I have to do my homework, so please turn off the TV
33. It rained very hard; however, he went out without a raincoat.
34. Please try to speak more loudly and clearly
6.
35. I am going to tell you how to keep the environment clean
36. Most of us discard too much garbage and this dirties the environment
37. We can reduce this amount by:
38. You can follow these simple rules
39. Not only can you keep the environment clean but you can also help natural resources be saved.
