6. Mr Smith has taught in this college since he was twenty.

Mr.Smith began teaching in this college when he was twenty

7. Nancy started to play the piano on Monday.

Nancy has played the piano since Monday

8. Tom began playing the piano 4 years ago.

Tom has played the piano for 4 years.

9. Jack and Jill have learned to drive for 2 weeks.

JackandJill started learning to drive 2 weeks ago.

10. When did they start to type their report ?

How long did it take them to start to type their report?

1. Did......talk

2. Did.....lie

a) PTk của h/c B=31.2=62đvC

b) H/c B có dạng X₂O

Ta có: 2X+O=62

=> 2X+16=62

=>2X=46

=> X=23

c) Tên: Natri, KHHH: Na

d) Khối lượng tính bằng gam: 23.1,66.10^-24=3,818.10^-23

1. He drove so carelessly that he had an accident last month. (such)
He was such a careless driver that he had an accident last month.
2. Dickens’s last novel was unfinished when he died. (without)
Dickens died without finishing the last novel.
3. Mark is too young to see the horror film. (enough)
Mark isn't old enough to see the horror film.
4. Everyone but Jane failed to produce the correct answer. (succeeded)
Everyone succeeded in producing the correct answer except jane
5. “How about going to the concert?” said John. (suggested)
John suggeested to go to the concert.

5. She is hot and coughs a lot. She's having flu.

6. She has decided to use less electricity by using more solar energy instead.

x³+1=x³+1³= (x+1)(x²-x+1)

a) Khoảng cách giữa A và B:

s=v.t=40.3=120km

b) Phải đi với vận tốc:

v=s:(3-1/2)=120:5/2=48km/h

c) Quãng đường người đó đi trong 1h đầu :

s1= 1.40=40km

Trên quãng đường còn lại người đó phải đi với vận tốc là:

v'= s₂.t₂= (120-40)(3-1-1/2)=80.3/2=120km/h

1. from

2. of

3. in order to

4. into

5. for

6. by

7. out

7. in

1.Choose the best option                                                                                  1.Binh is ____________. He likes helping his friends.                                   A.kind  B.creative  C.shy  D.clever                                                            2.A:"Can you pass me the pencil please?" - "______________"                  A.yes, I can  B.yes,I"d love to  C.yes,I do D.yes,sure                                  3.My parents ______ eat meat.                                                               A.don"t  B.aren"t  C.doesn"t  D.are                                                              4.Duong: " I am hunggry, Mum! " - Mum: " __________"                                   A.Would you like to go out?        B.Let's cook dinner now                   C.Why are you so hungry?    D.Here is some bread and butter for you     

 5.My house is ________ the river.                                                                      A.under  B.on  C.near  D.between                                                           6.Look! The girls _________ in the school yard.                                               A.skips  B.skipping  C.is skipping  D.are skipping                                    7.Mary _________ face every mornng.                                                              A.washes his  B.wash my  C.washes her  D.washes their                     8.She is always ________ at school and helps other students with their homework.                                                                                                 A.hard  B.hardly  C.hard - working  D.work hard                                     9.___________ is my book? - It is on the table.                                                 A.Where  B.What  C.Who  D.Which                                                       10. ___________ are you in? - I'm in grade 6.                                                    A.Where  B.Which grade  C.What  D.How many                                11.Do you ________ the housework after school?                                             A.do  B.go  C.take  D.get                                                                         12.I _________ dinner at seven fiter school?                                                       A.do  B.go  C.play  D.have        

1.Choose the best option                                                                                  1.Binh is ____________. He likes helping his friends.                                        A.kind  B.creative  C.shy  D.clever                                                                2.A:"Can you pass me the pencil please?" - "______________"                  A.yes, I can  B.yes,I"d love to  C.yes,I do D.yes,sure                                      3.My parents ______ eat meat.                                                               A.don"t  B.aren"t  C.doesn"t  D.are                                                                     4.Duong: " I am hunggry, Mum! " - Mum: " __________"                                   A.Would you like to go out?        B.Let's cook dinner now                                   C.Why are you so hungry?          D.Here is some bread and butter for you     

 5.My house is ________ the river.                                                                      A.under  B.on  C.near  D.between                                                                      6.Look! The girls _________ in the school yard.                                               A.skips  B.skipping  C.is skipping  D.are skipping                                               7.Mary _________ face every mornng.                                                              A.washes his  B.wash my  C.washes her  D.washes their                                  8.She is always ________ at school and helps other students with their homework.                                                                                                           A.hard  B.hardly  C.hard - working  D.work hard                                                 9.___________ is my book? - It is on the table.                                                 A.Where  B.What  C.Who  D.Which                                                                     10. ___________ are you in? - I'm in grade 6.                                                    A.Where  B.Which grade  C.What  D.How many                                               11.Do you ________ the housework after school?                                             A.do  B.go  C.take  D.get                                                                                    12.I _________ dinner at seven fiter school?                                                       A.do  B.go  C.play  D.have