Найдите промежутки возрастания и убывания функции f(x)=x^3+3x^2-9x+ 1

Выражение действия в будущем времени. Complete the sentences using will / be going to / Present Continuous:

1. I'm sure you __ the exam next week. (fail) 

a) are going to fail     b) will fail    c) is failing

2. Начало формы

Don't touch that dog, it __ Начало формы

 you. (bite) 

a) is going to bite       b) will bite    c) is biting

3. Начало формы

What time __ Начало формы

tomorrow. (leave)

a) are you leaving      b) will you leave    c) are you going to leave

Предлоги. Put the right preposition:

4. Where have you been __ Saturday?

5. Don’t forget to come __ school __ 8 a.m.

6. Do you know how to play __ chess.

7. Can she play __ piano?

Артикли. Choose the correct article: the/a/an/-

8. I would like to have __ piece of caka.

9. __ night is quien, let’s take a walk!

10. He doesn’t like __ milk.

11.Give me __ apple, please!

Условные предложения.  When/if clause…wish…

12. What __ (do) you sister when she __(finish) the school?

13. I __(help) your brother if I __(be) free after school.

14. Nick wisher he __(be) at school a week ago.

15. They wish they __(come) here befor.

Tag-? Complete the tag-questions?

16. __ Anna, isn’t she?

17. They don’t like coffee, __?

18. your dad hasn’t been abroad?

19. Her brother won the competition yesterday, __?

Present Continuous or Present Perfect Continuous. Fill the gaps:

20. Now Ted’s dad __(study) the life of sharks.

21. Lucy and Pat __ (learn) Spanish since their childhood.