как можно объяснить господство в палеозое древних папоротникообразных и их полное исчезновение в той же эре?!

сегодня надо. буду блогадарен.

               Tag Questions. 

Finish these sentences by addng a tag question with the correct form of the verb and the subject pronoun.

1.You're going to school tomorrow,____?

2.There's an exam tomorrow,_____?

3.Gary singned the petition_____?

4.Beverly will be attending the university in September,...?

5.She's been studying English for two years,...?

6.He should stay in bed,..?

7.You can't play tennis today...?

8.There arent any peaches left,...?

9.We've seen that movie,__?

1. Present simple or Present Continious

  1) I (not/understand) ______ Chinese.

  2) We (visit) ______ our grandparents on Sundays.

  3) Catherine (not/wear) ______ jeans today.

  4) Listen. The dog (bark) ______.

  5) Look at Ted. Why (he/waving) ______ his arms inthe air?

2. Выбрать правильную форму:

  1) Be careful! I think you WILL FALL / ARE FALLING soon.

  2) I promise I AM PHONING / WILL PHONE soon.

  3) I'm still hungry. I AM GOING TO ASK / AM ASKING for some more food.

  4) We WILL GO / ARE GOING TO GO on holiday tommorow.

  5) I'm sure it WON'T RAIN / ISN'T RAINING this afternoon. 

Почему Пётр построил новую столицу России(Санкт-Петербург)? Чем его не устраивала Москва?