1.We shouldn't walk because it is too far

Why shouldn't we walk?

2.They are going to stay there for a week

=> How long are they going to stay there?

3.Peter has three meals a day

=> How many meals does Peter has a day?

4.My mother is going to visit her friend this Sunday

=> When is your mother going to visit her friend?

5.His teacher is very young and nice

=> What is his teacher like?

6.We smell the noodles at the store

=> Where do we smell the noodles?

7.Her roommates are from Mexico

=> Where are her roommates from?

8.My brother is 170cm tall

=> How tall is your brother?

1.my new house is not the same á my old one.

-My new house is different from my old one.

2.It's very hard for children to live alone.

-Living alone is very hard for children.

3.Have you got a cheaper dress than this?

-Is this the cheapest have you got?

4.The play was very boring. We left early

-The play was so boring that we left early.

a/ 1 mol

b/ n = \(\frac{6,022.10^{23}}{6,022.10^{23}}=1\) (mol)

c/ \(n=\frac{6,022.10^{23}}{6,022.10^{23}}=1\) (mol)

\(\left(2\sqrt{5}+2\right)\left(2\sqrt{5}-2\right)=\left(2\sqrt{5}\right)^2-2^2=20-4=16\)

1. Now/she dances/beautifully/than/used to

=> Now she dances beautifully than she used to.

2. Last Wednesday/Bill/ring/office/nine o'clock

=> Last Wednesday , Bill rang to his office at nine o'clock.

3. Billy/an old man that/has to live with his children

=> Billy is an old man that has to live with his children.

4. Oliver Twist/first published/1838

=> Oliver Twist was frist published in 1838.

5. It/too heavy/him/lift

=> It's too heavy for him to lift.

6. I/able to/come/tomorrow

=> I'm able to come tomorrow.

used | on | afford | enough | every | soon| wait | used | listening | home | few | who | what | won | all

here was once a large, fat woman WHO had a small, thin husband. He had a job in big company and was given his weekly wages EVERY Friday morning. As SOON as he got HOME on Friday, his wife USED to make him giver her ALL his money, and then she AFFORD to give him back only ENOUGH to buy his lunch in the office every day.

One day the small man came home very excited. He hurried into the living room. His wife was LISTENING to the radio and eating chocolates there.

"You'll never guess WHAT happened to me today, dear." he said.

He waited for a few seconds and then added, "I'll WON ten thousand pounds ON the lottery!"

"That's wonderful!" said his wife delightedly. But then she thought for a FEW seconds and added angrily : "but WAIT a moment! how could you USED (?) to buy the ticket?"

1.My sister is very fond ....... chocolate candy

A. of B. about C. with D. at

2. Listen ..... our teacher!

A. with B.to C.for D.in

3. How long will it ..... to get there?

A. cost B.lose C.make D.take

4.he looked very ......... when I told him the news

A.happily B.happy C.happiness D.was happy

5. She is ...... in history

A.interests B.interested C. interesting D. being interest

6.It began to rain while we ...... soundly

A.slept B.were sleeping C.have slept D. are sleeping

7. I won't go to bed ...... I finish my homework

A.until B.when C.while D.since

71. People/ my town/ have/ three meals/ day/ breakfast, lunch, and dinner

People in my town have three meals a day : breakfast , lunch and dinner.

72. They/ have/ breakfast/ 7 o'clock/ morning/

They have breakfast at 7 o'clock in the morning.

73. It/ a light meal/ but/ it/ considered/ important/ with/ a bowl of beef noodle soup (pho)/ noodles with pork (hu tieu), instant noodle/ a plate of sticky rice (xoi).

It is a light meal , but it is considered being important with a bowl of beef noodle soup (pho) or noodles with pork (hu tieu) , instant noodle or a plate of sticky rice (xoi)

74. Lunch/ usually start/ 11.30/ also a light meal/ followed/ an hour's rest.

Lunch usually starts at 11.30 and also a light meal is followed for an hour's rest.

75. Most employees/ have/ lunch/ foodshops/ near/ working places.

Most employees have lunch at foodshops near working places.

76. Students/ have/ lunch/ school canteens.

Students have lunch at school canteens.

77. People/ often have/ rice/ meat/ fish/ vegetables/ but young people/ often/ fastfood/ shops/ Lotteria, Jollibee, and KFC.

People often have rice with meat, fish and vegetables, but young people often have fastfood at shops like Lotteria, Jollibee, and KFC.

78. Dinner/ main meal/ including rice/ with many dishes/ meat/ fish/ eggs/ tofu/ vegetables.

Dinner is main meal and including rice with many dishes like meat, fish, eggs, tofu and vegetable.

79. People/ prepare/ food/ boiling/ steaming/ barbecuing/ frying/ then/ fruit/ green tea.

People prepare food by boiling, steaming, barbecuing, frying and then eat fruit or green tea.

80. I/ think/ Vietnamese food/ cheap/ nutritious/ very delicious.

I think Vietnamese food is cheap , nutritious and very delicious.

I want some breads and a bottle of milk

=> bread

452 chia a dư 32 ; 321 chia a dư 21 

=>452-32=420 chia hết cho a;321-21=300 chia hết cho a

Ta tìm ƯCLN(420 và 300)

420=2².3.5.7

300=2².3.5²

ƯCLN(420 và 300)=2².3.5=4.3.5=12.5=60

Vậy a=60