как называется алкан с четырьмя атомами углерода и метилом у второго атома​

1. Complete the sentences with a past participle from the task 1.
A) Have you ever won the prize?
B) I have ___two e-mails.
C) Have you ever ____anything online?
D) Have you ever ____anyone famous?
E) My brother has ____to Astana.
F) Ann has ____her classmate with her homework.
G) My mother has ____a letter to her schoolfriend.
H) I`m not hungry. I have just ____breakfast.
I) Mary has ____an interesting book.
J) I have ____a singer from A-Studio.
2. Write this sentence using the First Conditional with these words:
We, our, the future, care for, a lot of, don`t, problems, if, have, generation, world, will, health.
Если мы не будем заботиться о нашем мире, у будущего поколения будет много проблем со здоровьем.
3. Complete this sentence using the Second Conditional.
If I ____a forester, I ________trees every year. (but I`m not a forester, I don`t plant trees every year)
4. Put in like or as.
A) It`s raining again. I don`t like weather ____this.
B) A few years ago she worked ____a secretary.