Безотлагательно нужна помощь,задание один пожалуйста

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1 If you gave me your address, I would write you a letter.
2 If they didn't go to Moscow last year, they wouldn't visit that museum.
3 If you speak English every day, you will improve your language skills.
4 If he doesn't read so much, he won't know English literature so well.
5 If he lived in St. Petersburg, ,he would go to THE Hermitage every week.
6 If it snows, the children will play snowballs.
7 I would phone you immediately, if I knew the results.
8 If Tom saw a car crash, he would telephone the police and would help the people in the car.
9 I will be happy If I get this book.
10 If he invites us, we will come to the party .
11 If my mother won a million pounds, she would spend it as much as possible.
12 If the driver doesn't stop , the accident won't happen.
13 If she tells about the birthday party, they will give her a present.
14 They would save the time if they went by car.
15 If a dog bite her on the leg, she would go to the hospital.