Đốt cháy 9g hợp chất hữu cơ A thu được 26,4g khí co2 và 16,2g h2o. tìm ctpt của A biết khối lượng mol của A là 30g/mol

1.     Tourism has certainly _____ an important factor in the development of many countries.

A. to become                 B. become               C. became               D. becoming

2.     Tourism has contributed__________ to the income of this region.

    A. many                       B. big                      C. great         D. greatly

3.    This is the place__________ I first met her.

    A. what                        B. where                 C. which       D. that

4.    Let me see all the letters ____________ you have written

    A. who                         B. that           C. whom                 D. which

5.    She is the one__________ I think is the best student in the class.

    A. what                        B. which                 C. whose       D. whom

6.    If you ______ to me, you wouldn’t get so much trouble.

    A. listened                    B. would listen        C. had listened D. would have listened

7.    He had _____ two expeditions to Spain to study wild plants by the end of 2010.

    A. taken                       B. made                  C. done         D. gone

8.     If I ______ you, I ________do that.

    A. am/ will                   B. were/ would        C. were/ will D. had been/ would

9.    “What is the longest English word that doesn’t contain a vowel? I’d say tsktsks.” “____”

    A. How come?              B. Sound exciting! C. Spot on.      D. Of course, it is.

10. “Do you find it interesting to travel alone?” “ ________”

    A. You’re welcome      B. Never mind.        C. What a pity! D. No, not at all.

Choose the underlined word or phrase, A, B, c or D that needs correcting.

11.  If a drop of oil is placed in a glass of water, it would float to the top.

   A                          B                                             C                   D

12. We have a smart TV where can be used as a computer.

                      A                 B                       C      D

13. Mr. Brown, that teaches me English, is coming today.

                           A          B                              C     D