31. He could not afford to buy the car.
      The car......................................................................................................................
32. "Why don't you put your luggage under the seat?" he asked me.
      He suggested...............................................................................................................
33. Although he had a good salary, he was unhappy in his job.
In spite................................................................................................................................
34. I advise you to put your money in the bank.
      If I………………………………………….........................................................
35. It is not certain that Jones will get the job.
-> It is open …………………………………………………………………………..
36. David started studying Vietnamese in 2018.                
  David has ………………………………………
37. “Do you live in Can Loc town?”, he asked me.          
    He asked me …………………………………
38. They will build a new hospital near the river.               
  A new …………………………..
39. The fox was unsuccessful in reaching the grapes.      
    The fox tried in ……………………………………
40: He gave my sister a smart phone on her birthday.
=> My sister was ……………………………                
41: Reading books  is very exciting.
=> It is ……………………………
42 . It isn't nice, so we can't go for a picnic.
=> If it ………………………………………
43.It was too hot for us to go swimming yesterday
It was so……………………………………
44. They have to work hard everyday
They wish…………………
45.He works hard .They want to pass the entrance exam next week.
    He works hard so as……………………………………..
46. Please don’t play your music so loudly.
Would you mind………………………………….?
47. “When does the film start?” said Nam to me.
Nam ………………………………………………
48. Children shouldn’t swim in this pool because it is too deep.
This pool is not………………………………………..
49.It is years since I met her.
I haven’t ……………………………………………….
50 .Could you drive a car when you were a student?
You ……………………………………………..?

Choose the best answer

 1.Look! The boys …………… basketball in the school yard.

A.play                 B. are playing          C. played                    D. were playing

2.A runny nose, sneezing and coughing are the……  of common cold.

A. materials       B. measures             C. medicines             D. symptoms

3. The president is going to pay a state visit to Japan, …  he?

A. does              B. doesn't                 C. is                              D. isn't

4.  Remember …… the instruction carefully before you use it.

 A. reading       B. to read                  C. read                        D. for reading

5.She has worked as a secretary …… she graduated from college.

 A. before         B. since                      C. when                       D. until

6.The boy's family is very poor. He has to go to school on foot. He wishes he………enough money to buy a bike.

A. has           B. will have                   C. had                                      D. has had

7.Did the Second World War last from 1939 … 1945?

A. in             B. at                              C. on                                        D. to

8.It is very noisy. I can't hear what he is saying. Can you …………………… the radio?

A. turn up     B. turn off                     C. turn on                     D. turn around

9: Mai and Lan are attending a party.

- Mai: "Would you like some more Coke?" - Lan: " ………………… .”

A. I think so            B. I'm not sure                 C. Yes, let's    D. Yes, please

10. ...................the weather was not fine yesterday, we still went to the beach with our friends.

          A. Although                B.So                          C. However                      D.Therefore

11.  My brothers ............... in the room when the phone  rang last night

          A. was sleeping           B. sleeping                C. were sleeping               D. sleep

13. Hoa: “We are going on a trip to Ha Long Bay next week!” 

       Nam: “Really? ..........................!”

        A. Good job        B. Have a good time     C. It's your pleasure               D. Take your time  

14. She was really impressed _______ the friendliness of the people here.

        A. with                B. in                     C. by                                 D. on

15. Malaysia is…….. into two regions: The East and the West Malaysia.

            a. separate                 b. divided                  c. parted                     d. comprised

16. Nobody went to the party, _________?

     A. does he                      B. do they                      C. didn’t they                         D. did they

17. They said they ______ there the next day.

     A. go                            B. went                 C. would go                D. will go

18. Lan wishes she ………….have to clean all the windows.

A. don’t                      B. doesn’t            C. wasn’t                            D. didn’t

19. "I think I've lost my new pen. I've______ it everywhere but I can't find it anywhere."

      A. looked after             B. turned on                    C. looked for                    D. turned off

20.   They are not_________to take part in this program of the World Health Organization.

      A. so old                           B. old enough             C. enough old             D. as old

21.   The football match was postponed _________the bad weather.

      A. despite                          B. in spite                    C. because                   D. because of

22.   Peter doesn’t like scuba-diving. _________does his brother.

      A. Too                               B. Neither                   C. So                           D. Either

23.   If I had the map now, I_________a short-cut across the desert.

      A. could have taken          B. take                         C. could take               D. can take

24. If I  were you, I would advise _________the new teaching method.

      A. try                                 B. trying                      C. to try                       D. tries

25. My father is very busy. _________, he is always willing to give a hand with the housework.

      A. Despite                         B. Although                C. However                 D. Therefore

26. The capital of Thailand is_________.

      A. London                                    B. Paris                        C. Bangkok                 D. Phnom Penh

27. If I_________you, I’d take some rest before the exam tomorrow. 

      A. is                                   B. are                           C. were                        D. would be

28. It was_________hot day that we decided to leave work early.

      A. such                              B. so                            C. so a                         D. such a

29. Let’s go for a walk, _________we?

      A. will                               B. shall                        C. do                           D. must

30. James Watt, whose invention is the steam engine, was a famous Scottish_______.

       A. musician                      B. mechanic                C. engineer                  D. electrician

Tìm x

2^x+3-2^x+1+2^x+2=64

Cho S=1+3+3²+...+3³⁰

a,Tìm chữ số tận cùng của S

b,Chứng tỏ S không phải là số chính phương

Cho A=3+3²+3³+...+3²⁰²¹

Tính 2A+3

Tìm n

48:2ⁿ⁺¹=3