Tìm lỗi sai và sửa lại

1. I had my luggage carry to the trains

2. The country air is fresh , however it is not polluted

3, The more dark it is, the more cold it get

4. They could see smoke to rise up from cottages

5. The more he eats, he bacome fatter

Cho dạng đúng của động từ trong ngoặc

1. Have you ever seen a mother bird ( feed) her babies

2. I couldn't buy that dress because when I came the clothing store, it (sell)

3. He ( sleep) soundly when the rain started.

Viết lại các câu sau sao cho nghĩa không đổi

1. I had told my brother to close the door before I went to school

2. The house is largest . It is expensive

3. The policeman run fast. He can catch the thief

4. The questiones were easy enought for me to answer

5. He is a very lazy pupil. He never does his homework

6. My friend gave a gift to her. They are telling about their trip

1. I learn English a lot. I like it a lot.’

= >The more ...

2. The film was very good. We saw it through. ’

=> The film was good enough…

3. The performing is very long. They can’t broadcast it.

’ => The programme is too ...

4. Mr. Green told them about Charles Dickens.

’ => They asked Mr. Green ...

5. They did their homework at 6 o’clock. They watched the football game on TV at 7 o’clock

=> After ...

=> Before ...

6. They produce a lot of paper. They need a lot of wood pulp.

=> The more paper ...

7. The school girls will do needlework at home.

=> The principal said that ...

8. Last year I got many bad marks.

’ I wished I ...

P=(\(1-\frac{\sqrt{x}}{\sqrt{x}+1}\)) : \(\left(\frac{\sqrt{x}+3}{\sqrt{x}-2}+\frac{\sqrt{x}+2}{3-\sqrt{x}}+\frac{\sqrt{x}+2}{x-5\sqrt{x}+6}\right)\)

a) rút gọn P

b) tính giá trị của a để P <0

P= \(\frac{\sqrt{a}+2}{\sqrt{a}+3}-\frac{5}{a+\sqrt{a}-6}+\frac{1}{2-\sqrt{a}}\)

a) Rút gọn P

b) Tìm giá trị của a để P <1

Cho các polime sau: sợi bông (1), tơ tằm (2), sợi đay (3), tơ enang (4), tơ visco (5), tơ axetat (6), nilon-6,6 (7). Loại tơ có nguồn gốc xenlulozơ là?

A. 5, 6, 7.

B. 1, 2, 3, 5, 6.

C. 1, 3, 5, 6.

D. 1, 2, 5, 7.