25. D→entertainment
B→sings
26. D→listened
D→had died
27. C→because of
C→because
28. B→happily
B→mountainous
29. Unless the man arrives, we will start the conference without him
Unless you come soon, you may not meet us
30. It is very important to speak English in class
It is not easy to help him overcome the sock
31. I suggest going to the supermarket
Mrs. Hoa suggested I should turn off the lights before going out
32. My sister, who always does her homework before going out, is a hard-working student
The girl who lives next door to us, is very friendly
33. I've drunk 6 cups of coffee today since I've got a headache
Although it rained hard last night, he came to the meeting on time
34. If we pollute the water, we will have no fresh water to use
If I see Mary today, I will call you
