1. After much persuasion, my parents finally ________ me to go for the camp

A. allows       B. allowing          C. allowed      D. had allowed

2. Susan _______ for more than an hour for her best friend to arrive

A. wait        B. waited        C. is waiting      D. have waited

3. The Christmas celebration at my grandparents' house a few years ago ________ most memorable for me

A. is        B. are         C. was           D. were

4. Except for Linda, the other members of the cast ________ well prepared for the coming musical 

A. is          B. are          C. was        D. have

5. The beggar we saw ________ by the side of the road used to be a wealthy businessman 

A. sit         B. sitting         C. sat            D. sits

6. The worker was pushing a wheelbarrow full of bricks when he _________ over a rock

A. trips      B. had tripped         C. tripping      D. tripped

7. The Buddhist temple, as well as the other Hindu temples, ___________ become a tourist attraction

A. has            B. have            C. was           D. were 

8. After he ________ the singing competition, Francis started work on his first album

A. wins         B. had won       C. was winning       D. win

1 + 1 = 2

Choose the answer 

1. Someone __________ my watch. It is now at the police station

A. find           B. finds            C. has found          D. have found

2. The children finally ________ at their destination after a tiring hike

A. had arrived       B. arrived        C. are arriving         D. arrives

3. The natives of a country __________ known as aborigines. They lead simple lives

A. is        B. are           C. was            D. were

4. The man who _______ vegetables at the market then is now running his own vegetable farm

A. sold           B. have sold        C. sells           D. is selling

5. The housing agent assured his client that he would ________ her to find the home that she wanted 

A. helps        B. helped         C. helping        D. help

6. Due to the rain, most of the students _________ more than ten minutes late for school  just now

A. is           B. are            C. was           D. were

7. Jeremiah, as well as his parents, _______ watching football together at the stadium once a month

A. enjoy      B. have enjoyed      C. are enjoying      D. enjoys 

8. Seaweed _________ calcium that is good for building strong bones and teeth

A. contain       B. contains       C. has contained      D. contained

9. All the costumes for the musical ________ already ____________

A. have - been sewn           B. was - sewn

C. has - been sewn            D. is - sewn

10. Ben __________ a book when the lights went out

A. read       B. is reading       C. has read       D. was reading

3/4 + 12/18 + 20/45 + 16/48 + 45/81 + 25/100 

= 3/4 + 2/3 + 4/9 + 1/3 + 5/9 + 1/4

= (3/4 + 1/4) + (2/3 + 1/3) + (4/9 + 5/9)

=         1 + 1 + 1

=       3

has visited - was

ko có j 

1. Will - join

2. plays

3. will give

Nếu ta rót 15 lít dầu từ thùng thứ nhất sang thùng thứ hai thì tổng vẫn không thay đổi

Ta có sơ đồ biểu thị hai thùng dầu lúc sau:  

Thùng 1 !-----------!----------!----------!----------!          (móc tổng): 154 lít       

Thùng 2 !-----------!----------!----------!

Tổng số phần bằng nhau là:

        3 + 4 = 7 (phần)

Số dầu lúc sau ở thùng thứ nhất là:

 154 : 7 x 4  = 66 (lít)

Số dầu ban đầu ở thùng thứ nhất là:

66 + 15 = 81 ( lít )

Số dầu ban đầu ở thùng thứ hai là:

      154 - 81 = 73

Đáp số : thùng 1 : 81 lít dầu

              thùng 2 : 73 lít dầu

a - d - d - c - a - c - d - a - b - b 

Đáp án

1. b
2. d
3. c
4. a
5. b
6. b
7. c
8. c
9. d
10.a

11. b
12. a
13. d
14. a
15. b
16. c
17. d
18. b
19. a
20. c