Cho 3 điểm A,B,C sao cho AB = 2,7cm,BC = 5,7cm,AC = 8cm.Hỏi 3 điểm A,B,C có thẳng hàng không?Vì sao?

Xác định thành phần rút gọn có trong câu sau: Khi nào mắt tinh, tay dẻo thì mới vẽ được mọi thứ.

Rewrite the following sentences using TO INFINITIVE.

1. He opened the window because he wanted to let fresh air in.

2. I took my camera because I wanted to take some photos.

3. We filled the car up because we didn’t want to run out of petrol.

4. I didn’t want to see them, so I didn’t open the door.

5. He did not want to worry her, so he did not tell her what happened.

6. Tom was playing very softly so that he wouldn’t disturb anyone.

7. The boy tiptoed into the room so that he wouldn’t wake every body up

3. When _____? - In 1928. A. penicillin was discovered B. was penicillin discovered C. penicillin has discovered D. has penicillin discovered

4. Most of the work _____ before the start of the 20th century. A. is completed B. was completed C. has been completed D. had been completed

5. The bus drivers went on strike _____ we had to walk to school. A. so that B. because C. so as to D. so 6. In our village, many people do not have _____ much money. A. too B. more C. the D. ---

7. Whenever we meet Bob, he always _____ to avoid _____ at us. A. try / to look B. tries / looking C. tries / look D. tried / looked

8. Peter told me _____ worried and promised _____ me whenever I _____ in difficulty. A. not being / help / am B. not to be / to help / was C. not be / to help / were D. not to be / to help / would be

9. I don't think _____ possible to guess a person's character by appearance. A. they B. them C. its D. it

10. She usually bothers us _____ her boast. A. with B. of C. from D. for

ét o ét

ét o ét

gọi tên

tên muối + tên KL + hóa trị + tên gốc acid

1. Na₂CO₃

2. NaHSO₄

3. Ca₃(PO₄)₂

4. Ca(H₂PO₄)₂

5. MgCl₂

6. Al(NO₃)₃

7. FeS

Fill in the blanks with the appropriate words in the box: paintings volunteer airport accident invited arrested dancing interview storm out

1. The boy injured in the__________ was taken to the hospital.

2. I had an___________ for a job in London last week.

3. The students planting flowers in the park are in the_____________ group.

4. Somebody called you while you were___________.

5. Who is the girl.__________ with your brother?

Combine each pair of sentences, using present participle or past participle.

1. The man is Mr.Nam. He teachers English in this school. →________________________

2. The woman is my mother. She understands me best. →________________________

3. The best footballer is Công Vinh. He plays football very beautifully. →________________________