Đốt cháy hỗn hợp 2 hiđrocacbon thuộc dãy đồng đẳng nào sau đây, ta luôn luôn được số mol CO₂ lớn hơn số mol H₂O?

 A. xiclopropan và anken.                    B. anken và ankin.     

C. ankan và ankin.                              D. anken và ankan.

Cách tính số liên kết π + vòng của C₈H₈.

30. Ba and Hoa usually ____________ videos.
A. watch         B. are watching         C. watches         D. to watch
31. They are interested in ____________ Chinese.
A. speaking         B. speak         C. speaks         D. to speak
32. Science books are on the shelves ____________ the left of the room.
A. at         B. in         C. on         D. to
33. My uncle enjoys ____________.
A. dancing         B. dances         C. is dancing         D. dance
34. In____________, we do some experiments.
A. Math         B. History         C. Music         D. Chemistry
35. How is her new school____________ her old school?

A. different from         B. different     C. from         D. from different

36. Will you ____________ free tomorrow evening?- Yes, I will.
A. are         B. be         C. is         D. am
37. What ____________ an expensive dress!
A. is         B. are         C. be         D. ф
38. What time does Lan have her Physics ____________?
A. periods         B. hour         C. period         D. class

39. Look! Here is Nam. He __________the guitar in the room.
A. play B. plays C. is playing D. will play
40. She __________some of her friends to her birthday party next week.

A. invites         B. inviting         C. will invite     D. going to invite

41. I have English class __________seven o’clock __________Monday.
A. at / on         B. on / on         C. in / at         D. at / at
42. __________a lovely living room!
A. How         B. What         C. It         D. When
43. Let’s __________to school.
A. going         B. to go         C. go         D. goes
44. Mr. Jones has __________summer vacation every year.
A. a three-week         B. a three weeks         C. a three- weeks         D. a week- three
45. There isn’t __________water in the bottle. It’s empty.
A. a             B. any         C. many         D. some
46. I’m going to stay __________my grandparents.
A. with         B. to         C. at             D. on
47. It’s __________in the winter and__________ in the summer.
A. cold/hot         B. hot/cold         C. warm/ cold         D. hotter/warm
48. What about __________fishing?
A. go         B. going         C. to go.             D. to going
49. There is __________work in the city than in the country so her father often goes
there.
A. less         B. few         C. more         D. much
50. We study about different countries in ______ class.
A. literature         B. geography         C. history         D. math

1. Yours
2. Her
3. Its
4. Their
5. It
6. He/her
7. myself
8. his
9. my/my

A

II.
1. Deforestation
2. Awareness
3. admission
4. infectious
5. academic
6. geological
7. alternative
8. analytic
9. graduation
10. broaden