1. That letter..............last night by her (wrote / was wote / was written / write ).
2. They ...............this house since last year ( build / built / to build / have built).
3. We were having dinner................the phone rang (since / for / when / as)
4. I take part ....................most youth astivities of my school ( of / on / to / in)
5. Nga asked me......................a driving licence.(if / whether / if I had / whether I have).
6. I don’t know how.................the game ( playing / plays / played / to play)
7. He is anxious ............ for the test results ( wait / to wait / waiting / waits )
8. I have to go to the bank in order ............. some money. ( change / changing / to change / changes ).

1, It's ages since I went to an Italian restaurant.

2, By the time we get to the theatre, the play will have begun.

3, You ought to have your hair cut.

4, An apple a day is thought to do you good.

5, I've never played water-polo before.

1. The Greens family moved to Ho Chi Minh City in 2002.

->The Greens__have lived in Ho Chi Minh City since 2002_____

2. Her grandmother began collecting stamps three years ago.

->Her grandmother has__collected stamps for three years___

3. We started living here ten years ago.

->We have __lived here for ten years___

4. It’s five years since she last saw him.

->We haven’t _seen him for five years__

5. The last time she visited our village was in 1992.

->She has_not visited our village since 1992__

6. This is the first time I have eaten nachos in the USA.

->I have__never eaten nachos in the USA___

7. Minh bought his CANON digital camera in 2001.

->Minh has_bought his CANON digital camera since 2001___

8. I last saw you when we were in senior high school.

->I have _not seen you since we were in senior high school__

9. When she heard the results, Mary began to feel more confident.

->Since hearing the results, Mary has begun to feel more confident

10. When did you begin studying information technology ?

->How long _have you studied information technology?__

11. How long have Emma and David been married ?

->When did Emma and David marry?

12. There is a definite improvement in your work.

->Your work has__a definite improvement___

13. I am on the tenth page of his letter I am writing.

->So far I have written on the tenth page

14. When I lived in England, cycling to work was part of my daily routine.

->I used to cycle to work when I lived in England

15. The red book is more expensive than that blue book on the shelf.

->That blue book on the shelf is cheaper than the red book

16. She is always a better performer than her mother used to.

->Her mother never used to give as good performance as she

17. Miss Huong Tram is the best student in this class.

->No one in this class is better than Miss Huong Tram

18. My close friend cannot run as fast as me.

->I am a ( Câu này có sai đề ko nhỉ???)

19. In class 6A, Minh is the most intelligent student.

->No one in the class is more intelligent than Minh

20. No other members in the club are as tall as Lucie.

-> Lucie is the tallest member in the club

I haven`t been to an Indian restaurant for ages.since

It`s ages since I went to an Indian restaurant.

when she heard the results, Mary began to feel more confident.become

Since hearing the results mary has become more confident

Đáp án:

$P=0,78N$ 

Giải thích các bước giải:

Ta có: $\{\begin{array}{c}\Delta P=0,15N\\ d_n=10000N/m^3\\ d_s=78000N/m^3\\ V_r=5c{m}^3=0,000005m^3\end{array}$

Trọng lượng của viên bi khi ở ngoài không khí là: P

Khi nhúng vào nước ta có:

$P^{\prime }=P-F_A\Rightarrow F_A=P-P^{\prime }=0,15N$

Lại có: $F_A=d_n.V\Rightarrow V=\frac{F_A}{d_n}=\frac{0,15}{10000}=0,000015m^3$

didn't call her up 2 days ago.
I haven't called her uo for 2 days
Did you finish the test an hour ago?
Have you finished the test for an hour?
I started playing tennis last year.
I've played tennis since last year
I haven’t seen him for a week
It’s a week since I last saw him
When did you first see her?
How long have you first seen her?
She didn't learn hard in 2005.
She hasn't learned hard since 2005
He has used the computer since he was 19
He began using the computer when he was 19
Peter has watched that film since last month
It’s last month since Peter last watched that film
The boys began playing soccer a year ago.
The boys have played soccer for a year
Has Dad worked here since I was born?
Did Dad work here when I was born?
The last time We saw her was 2 months ago
We haven ‘t seen her for 2 months
Tom did not work here when I met him on the street
Tom has not worked here sice I met him on the street
This is the first time he forgot his bag
He has never forgotten his bag before
Haven’t you used this car for a long time ?
Did you use this car a long time ago?
Is it the first time your father drunk that wine
Did your father drink that wine before?
This car is the most mordern I’ve used
I’ve never used such the most modern car before
It’s four years since I learnt in Hoa Lien school
I have learnt in Hoa Lien School for 4 years
She last wore that dress at her sister’s wedding
she hasn’t worn that dress since her sister's wedding
When did you start working in that factory?
How long have you worked in that factory?
Nam hasn’t written to his friend since 2005
It is 2005 since Nam last wrote to his friend
It is the first time I have heard about that
I have never heard about that before
They have’t played volleyball since last year
It is last year since they last played volleyball
Mr Nam has worked in this factory for years
Mr Nam started working in this factory years ago
Hoa hasn’t met me since she went abroad
Hoa last met her when she went abroad
Mr Lam started learning French on september 2nd
Mr Lam has learned French since September 2nd
He has used this car since he bought a new house
He began using this car when he bought a new house
She didn't learn hard in 2005.
She hasn't learned hard since 2005
Peter watched this film when he came home.
Peter has watched this film since he came home
It's a week since I last saw her.
I haven't seen her for a week
The boys began playing soccer a year ago.
The boys have played soccer for a year
Did Dad start to work here when I was born?
Has Dad worked here since I was born?
When did you first see her?
How long have you first seen her?
The last time We saw her was 2 months ago
We haven ‘t seen her for 2 months
Tom did not work here when I met him on the street
Tom has worked here since I met him on the street
This is the first time he forgot his bag
He has never forgotten his bag before
Children began to play games at 9pm
Children have played games since 9 p.m
When did you first know her ?
How long have you first known her?
I have never tasted the cake before
This is the first time I've ever tasted the cake
I haven’t played tennis since 1990
The last time I've played tennis was in 1990
I haven’t been to Briton for three years
The last time I've been to Briton was three years ago
I have never met such a famous person before
It’s the first time I've vẻ met such a famous person
I’ve never eaten this before
It’s the first time I've ever reaten this

Complete the second sentence so that it has a similar meaning to the first sentence using the word given. Do not change the word gien. You must use between two and five words including the word given.
a) Steve started learning the violin a month ago.
learning
Steve ... has been learning ... the violin for a month.
b) I haven t been to an Indian restaurant for ages.
since

didn't call her up 2 days ago.
I haven't called her uo for 2 days
Did you finish the test an hour ago?
Have you finished the test for an hour?
I started playing tennis last year.
I've played tennis since last year
I haven’t seen him for a week
It’s a week since I last saw him

Did you finish the test an hour ago?
Have you finished the test for an hour?

Did you finish the test an hour ago?
Have you finished the test for an hour?