Đặc điểm nào sau đây là đúng khi nói về quần thể?
A. Bao gồm nhiều loài sống trong một hệ sinh thái.
B. Bao gồm các cá thể thuộc cùng một loài.
C. Là một tập hợp các cá thể khác nhau.
D. Cả A, B và C.

1 I/ live/ Hanoi/ capital/ Vietnam.

2. You/ ever/ forget/ turn off/ mobile/ cinema/ concert?

3 Singing/ good/ health.

4. I/ good/ learn/ languages.

5. Which sports/ you/ enjoy/ watch?

Gi úp mình với

Rewrite the following sentences using Must(n't), Should(n't) and forms of Have to.

1. Why was it necessary for you to go to school last Saturday?

Why did you

2. I don't think it's a good idea for you to spend too much time playing games. 

You

3. It's necessary for the children to wear a uniform.

The children

4. I think it would be a good idea to say sorry to your parents.

You

5. It is not a good idea for you to drink so much coffee.

You

6. It is not necessary for him to apologize. He was absolutely right.

He doesn't

7. It is necessary for us to give him our answer today or we'll lose out on the contract. 

We have

8. It's a good idea for you to go and lie down.

You

9. It's not necessary for you to learn all the new words.

You

10. Is it necessary for you to attend every English lesson? 

Do you

11. It would be a good idea if Harry took a holiday.

You

12. It's not a good idea to leave a child unsupervised

You

13. It is necessary to register in advance to take the course. 

You

14. It is not necessary to read all those books.

You

15. I think she needs to spend more time with you.

You