Russian conjugation

Question 1

How do these words with the soft -ь end (prepositional ending)

Царь

Сибирь

Explain

Answer 1

О царе

В Сибйри

If the noun is masculine end with -e if it is feminine change to -и

Question 2

when is the prepositional case used

Answer 2

1) designate a place
2) designate the person or object being talked or thought about
3) when referring to dates

Question 3

Answer question and put correct ending on nouns
Где Она?
1) В (Лондон)
2) В (Москва)
3) В (Сибирь)
4) В (Англия)

Answer 3

Where is she

1) В Лондоне
2) В Москве
3) В Сибири
4) В Англии

Question 4

Answer the question & use the correct ending 
Где она?
1) В (Упражнение) 
2) В (Письмо)
3) О (Царь)
4) О (Ваня)

Answer 4

1) В Упражнении (In the exercise)
2) В Письме (in a/the letter)
3) О Царе (about the tsar)
4) О (Ване)