C. 2020 năm

1. My father wants me to become a doctor but I want to become a designer.

2. It is a challenging task, so it takes me a lot of time to do it.

3. Should I stay in and watch TV or should I hang out with friends today?

4. There are many festivals in Vietnam and many of them are held in the spring.

5. Did you stay at home last night or did you go out with your friends?

6. I broke my glasses yesterday, so I didn’t see things clearly.

7. My brother doesn’t socialize much, so he has very few friends.

8. A new camera is all I want now but I don’t have enough money.

9. Mary looks small and thin but she owns great strength.

10. I have many things to do tonight, so I reject my friend’s invitation to her party.

1. Tom asked him if/ whether he had visited his old school.

2. My aunt has got two teenage children, but they don't seem to get along with each other.

3. The boys stood on the bench so that they can get a better view.

4. Despite his good English, he wasn't chosen.

5. After he had breakfast, he went to work.

6. He asked her why she hadn't come there.

Lorena loves watching cartoons.

\(n_{NaOH}=\dfrac{m_{NaOH}}{M_{NaOH}}=\dfrac{20}{40}=0,5mol\)

1. Last week I was very busy and I didn't have the time to do a lot in the household.

2. On Monday I worked four hours overtime and came home very late in the evening.

3. From Tuesday to Thursday last week I was on a business trip.

4. On Friday I went to a friend's birthday party and at the weekend I visited my grandparents.

5. Tomorrow some friends are coming over. I have not seen them for ages and they have never been here before.

6. I have just cleaned my house so I can show them around.

When does Elsa usually come home?

2

- Our school year starts on September 5.

→ When does your school year start?

- Summer vacation lasts for three months.

→ How long does our summer vacation last? 

- The longest vacation is summer vacation.

→ Which is the longest vacation?

- I usually visit my grandparents during my vacation.

→ What do you usually do during your vacation?

- My mother works eight hours a day.

→ How many hours a day does your mother work?

- Mr.Robinson is an English teacher

→ What is Mr. Robison's job?

Bài 1:

a) 234 - 117 + (-100) + (-234)

= (234 - 234) - 117 + (-100)

= -277

b) -927 - (-1421) + 930 + (-1421)

= (1421 - 1421) - 927 + 930

= 3

c) 102 - (-33) - (-7) - 4 = 138

d) -71 - (-4) -22 - 10 = - 99

e) (-71+22) - (-29 - 81) + 99

= - 49 +110 + 99

= 160

f) (27 - 8 - 11) - ( - 267)

= 8 + 267

= 275