1) We shouldn't throw rubbish on the street. 2) Youtell your parents the truth. 3) Youtalk with your mouth full of food. 4) When someone gives you a present, yousay thank you. 5) In Britain, youput your elbows on the table when you are eating 6) Yoube careful in the street when it is dark. know about the rules of the game. be at home by 6.00 p. m. 7) Неknow about the rules of the game 8) Shebe at home by 6.00 p.m. 9) I keep losing my keys. What I do ?​

2 Should

3 Should not

4 Should

5 Shoud not

6 Should

7 Should

8 Should

9 Should

2) should

3) shouldn't

4) should

5) shouldn't

6) should

7) should

8) should

9) should

1. He needs more time to complete this task.
2. He needed to assemble his briefcase yesterday.
3. This Saturday I do not need to go to school.
4. You no longer need to buy pencils and pens: Mom already bought.
5. Do we need to say anything else?
6. You can not go to the library: I will give you my book.
7. My classmates need more time to perform this test.
8. You do not need to tell her about it, she already knows everything.
9. This Friday I need to meet Tom.
10. Do I need to attend this school club?
11. He does not need to bring this great book to school: It can be taken from the teacher.
12. For this dance we need to wear comfortable shoes.
13. You don't have to hurry.
14. She don't to go there: there is nobody there.
15. I do not need to train anymore: The competition has already ended

Объяснение:

Scientists believe increasing the level of telomerase in human cells would put people at greater risk of cancer. What’s more, it’s unlikely that simply increasing telomerase would be enough to keep us young because hundreds of enzymes are involved in the aging process. Although scientists don’t yet know exactly how and why we age, they have several theories. One theory is that as time passes, our bodies become less efficient at removing toxins from our cells. One way to try to stop the aging process is to keep cells as clean as possible. Scientists in New York successfully used this technique to restore the livers of old mice. The researchers bred special mice that did not lose their ability to remove damaged proteins from their livers