пожалуйстааааа помогите расставить it is и is it правильно умоляю

1. How far is it from Lesgaft University to the nearest underground?
2. "Is it raining now?" "Yes, it is. Take an umbrella with you."
3. "It is very late. Please, stay at home! It is dangerous to walk at nihgt."
4. "What time is it now?" "It is 10 o'clock. It is high time to begin our classes."
5. It is not far from Lesgaft University  to the swimming pool.
6. Is it expensive to rent a flat?
7. Is it difficult to to speak English?
8. It is Ann's birthday today. She's 18.
9. Is it difficult to take exam?
10.Is it true that he is an Olympic champion?
11.It is good to help your friends.