25. In Viet Nam, there are many ………………….throughout the year. (celebrate)
26. Western consumers are interested in products that will not only work ----, but also save money. (effective)
27. Nowadays ………………..can know when a volcano will erupt. ( science )
28. …………………., ao dai was worn by both men and women. (tradition)
29. The solar energy doesn’t cause ………………………. (pollute)
30. What should we do ------natural resources? ( preservation)
31.do you/ What / difficult? / do you/ aspect / of learning / English/ find / most /
32. our environment / I / the bins/ suggest / garbage / to keep / clean. / putting/ into
31. ______________________________________________________________
32. ______________________________________________________________
33. The book has disappeared. It has all the answers.
The book ______________________________________________________________
34. Why don’t we go to the countryside this weekend?
I suggest _____________________________________________________________
35. The girl doesn’t feel happy. Today is her birthday.
Although ______________________________________________________________
36. The river is too dirty for us to swim in.
Since_________________________________________________________