Sử dụng liên từ nối các câu sau : 

1. I bought a cell phone. I can use it to send and receive e-mail.

=>I bought a cell phone which I can use it to send and receive e-mail

2. My new cell phone has become a necessary part of life. I only bought it a month ago.

=>My new cell phone has become a necessary part of life what I only bought it on a month ago

3. My roommate has never been on the Internet. She is afraid of computers.

=>My roomate has never been on the Internet who is afraid of computers.

4. Now, there are psychologists. They help technophobes use technology.

=>Now, there are psychologists which help technophobes use technology

5. A lot of people suffer from technostress. Those people work in my office.

=> A lot of people suffer from technostress who work in my office

I feel very tired and afraid. Do you want to make friend with me?

1. examiner

2. reputation

3. exactly

4. available

5. edictor

6. advertise

7. information

8. improve

9. cultural

10. qualified

11. advertisement

12. speech

1. How long have you stayed here?

2. What does the weather like?

3. What did you see?

4. I spoke English all the time

5. Did you watch TV?          

6. Do you like to make some new friends?

7. I like Korea food

8. What do you like most?  

Cho hàm số   y = ax 3 + bx 2 + cx + d với  a ≠ 0  có hai hoành độ cực trị là x=1 và x=3. Tập hợp tất cả các giá trị của tham số m để phương trình f(x) = f(m) có đúng ba nghiệm phân biệt là:

A. .

B. .

C. .

D. .