Bài tập 1: Chọn đúng thì của các câu sau:
Chọn đúng thì của các câu sau
1.When she __had left __(leave) him, he ___became___(became) quite ill

2. I____was_____(be) looking for some photos when you rang but I ___didn't find_____( not find) them

chia động từ

1. I AM EATING ( eat) lunch at the eaffteria right now

Quá khứ / hiện tại hoàn thành :

1. I started writing this letter two hours ago

-> I have ___written this letter for two hours____

2. My father stopped drinking wine last year

-> My father hasn't ___drunk wine since last year. _____

3. The last time she went out with him was three weeks ago

-> She hasn't ___gone out with him for three weeks.____

4. It's two years since he last saw Mrs. Green

-> He hasn't ___seen Mrs Green for two years.____

5. She last read a newspaper at the end of the month

-> She hasn't ___read a newspaper since at the end of the month.___

6. They began to live on Doc Lap street two weeks ago

-> They have ___lived on Doc Lap Street for two weeks.__

7. My friend last worked at this grocery store in 2005

-> My friend hasn't __worked at this grocery store since 2005.____

8. Dick and Kate began teaching at that school in 1998

-> Dick and Kate have ___taught at that school since 1998.___

9. We started to study Math at seven o'clock

-> We have __studied Math since seven o'clock.___

10. It's a long time since I last played badminton

-> I haven't ___played badminton for a long time.____

Bài 1:

1. This magazine is......once a week

A. issue B. published C. sold D. found

2. It's very noisy, I can't...........you

A. listen to B. hear C. see D. look at

3. The......of football team usually wears a colored armband

A. Captain B. forward C. goal keeper D. defender

4. I tried hard but I couldn't .......him

A. take B. again C. win D. beat

5. They will build some....across the river

A. bridges B. cottages C. houses D. monuments

Mr. Brown and some (1)____conservationists are on a very dirty beach now. Today they are ready to (2)____ the beach a clean and beautiful place again. After listening to Mr. Brown’s instructions, they are divided into three groups. Group I needs to walk along the shore. Group 2 should check the sand, (3)____ group 3 has to check among the rocks. Garbage must be put into plastic bags, and the bags will be collected by Mr. Jones. He will take the bags to the garbage (4)_____. Each member will be given a map to find the right place. They won’t eat the picnic lunch provided by Mrs. Smith until the whole area is clean.they all are (5)____ to work hard so as to refresh this spoils_ area.

1. A. voluntary B. volunteers C. volunteering D. volunteer

2. A. make B. get C. do D. change

3. A. so B. but C. although D. and

4. A. dump B. yard C. area D. place

5. A. exciting B. interesting C. eager D. bored

chia động từ

1. I hope that you WILL HAVE (have) a good time tomorrow

2 .our class WILL HOLD (hold) an EL evening party next saturday

gọi: số cần tim là x 
thương của x chia cho 64 va 67 là a 
theo giả thiết ta có: 
x = 64a+38 
và x= 67a+18 
<=>64a+38=67a+14 
<=>(-3)a=(-24) 
<=>a=8 
vậy số cần tìm là x=64x8+38=550

viết câu hỏi của một người hoặc nhiều người nào đó đang làm gì và trả lời theo các từ đã được gợi ý

1.your mother/cook the meal

=> Is your mother cooking the meal?

2.you/sing a song

=> Are you singing a song?

3.thu /washher hair

=> Is thu washing her hair?

4.the girls/eat ice-cream

=> Are the girls eating ice-cream?

5.they /wait for the bus

=> Are they waiting for the bus?

6.thoes birls/ fly in the sky'

=> Are those birds flying in the sky?

7 the boy/swim in the river

=> Is the boy swimming in the river?

8 the man /work in hí ofice

=> Is the man working in his office?

9.Ba /drive his car

=> Is Ba driving his car?

10 mai and lan /do their homework

=> Are Mai and Lan doing their homework?

Tôi có cách này nhanh mà gọn hơn
Do p là số nguyên tố và p>3
 p = 3k+1 hoặc 3k+2 (k là số tự nhiên)
Nếu p=3k+1 thì 2p+1=2(3k+1)+1=6k+2+1=6k+3 chia hết cho 3 mà 2p+1 là số nguyên tố(L)
Nếu p=3k+2 thì 2p+1=2(3k+2)+1=6k+4+1=6k+5 không chia hết cho 3 (C)
 4p+1=4(3k+2)+1=12k+8+1=12k+9 cia hết cho 3 và lớn hơn 3 
 4p+1 là hợp số (đpcm)

I.Complete the second sentence so that it has the same meaningto the first sentence using word given

1.I had to cancel the birthday party because my closest friend is seriously ill.

-> I had to cancel the birthday party because of my closest friend's serious illness

2.Hung will write an essay on the life of President Ho Chi Minh

->An essay on the life of President Ho Chi Minh will be written by Hung.

3.I hadn's visited my grandfather.

->I wished I had visited my grandfather.

4.Although he came late he gained the highest result.

->In spite of his having come late,he gained the highest result

5.We hadn't know that Lan had an accident.We hadn't visited her.

->If we had known that Lan had an accident,we would have visited her

6.You shouldn't leave these magazines on the table.You should put them on this shelf.

->These magazines shouldn’t be left on the table,they should be put on this shelf

7.The flight to Ho Chi Minh City lasted one hour and a half

->It took one hour and a half to fly to Ho Chi Minh City

8."If you don't pay the ransom,we'll kill the boy",said the kindappers

-> The kidnapper threatened to kill the boy if they didn't pay the ransom.