Bài 1 : Hãy tính nồng độ phần trăm của những dung dịch sau :

a. 20 gam KCL trong 600 g dung dịch 

b. 32 gam NANO3 trong 2kg dung dịch

Complete the dialoguaes, using the present perfect of the verbs in brackets.

1. A. Do you know where Julia is ?

B: Yes, I ........ her in the street ( Just / meet)

2. A - What time is he going ?

B - He ............ ( already / go )

3. A - What is in the newspaper today ?

B - I don't know. I ......... ( not/ read/ yet)

4.A - Is Ann coming to the movie theater with us ?

B - No, she ........... that film ( already / see)

5. A - Are your friends here yet ?

B - Yes, they .................. ( just / arrive )

6. A - What does Tim think about your plan ?

B - I ............ ( not / tell / yet)

7. A - Shall I phone to reserve a table ?

B - I .............. it. ( already / do )

Write sentences, using the present prefect with already and yet.

1) He / drink / three bottles of beer

2. We / not hear / anything from them

3. You / post/ the letter ?

4. They / go / to Brazil

Write sentences, using the present perfect with already and yet

1. David/ leave/ the party

2. I/ not receive/ his letter

3. The manager/ come/ the office ?

4. We/ see/ that film.

5. Laura/ not find / a job.

6. It/ stop / raining ?

Ex : I / buy / a jazket => I have already bought a jacket

Complete each sentence with the suitable word in the box

monitor - computers - treshman - knob - guarantee - printer skeptical - library - bulletin board -  technology - time - consuming

1. A...... is a machine for printing text onto paper

2. This machine is still under so the manufacturer will repair it

3. Some ....  can work 50.000 times faster than a man

4.Some of the more ..... jobs can be clone by machines

5. Adjust the if the screen of the ......

6. Harry is in the first year at university. He is a .....

7. They post ntessages on the..... and find other people who want to talk about..... the same topic

8. I'm rather....... about his chances of winning

9. Many students are sitting and reading hooks and imtgazines in the.....

10. This ..... enables computers to read handwriting

decorate / clothes / traditional / visit / important / beautiful

Tet or Lunnar New Year holiday is the most (21) ......... celebration for Vietnamese 

people. Tet is a festival which happens in late January or early February. Before Tet, people usually clean and (22) ......... their homes. They go to the market to buy candy,jams, or dried watermelon seeds. They also get new (23) ............. which are worn at Tet. They often buy peach blossoms and marigolds which are (24) ........ flowers on Tet holiday. Tet is a time for family members to gather and have special food such as sticky rice cakers. People often (25) ........... relatives and family friends on the second of the holiday.

17. We are very interested ..........reading English books.

A.in             B. of                 C.on               D. for

18. In a .............. contest, particcipants have to make a fire

A. fire - making             B. water- fetching            C.rice - cooking               D. bull- fighting

19. Miss Blake is a ............... from Friends of the Earth.

A. representative               B. representer              C. represent            D. representation

20. Many years ago, Christmas songs ..................for people in towns and villages.

A. have performed          B. performed              C. were performing           D.were performed

31. " I am a computer programmer" Tom said

--> Tom said that........

32. " Do you like sports" She asked him

--> She asked him............

33. Santa Claus gave children presents on Christmas Eve.

-->  Childen were..............

34. Could you open the windows?

---> Do you mind .........?

35.Finding accommodation at busy time in this town is difficult 

---> It is .........

14.They boy ..............a book is Ba

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

15.If a patient can't walk, he can use ....... to move around.

A. an eye chart        B. a stretcher          C. a wheelchair            D.a scale

16. The Pyramid of Cheops is one of the seven......... of the world

A. Pyramids           B. temples            C. landmarks         D. wonders