Choose the correct pronouns among where, when, why to complete these sentences

I. Choose the correct pronouns among where,when,why to complete these sentences.

1. This is the restaurant I first met my husband.

2. July and August are the months most people go on holiday.

3. Do you know the reason she left so early?

4. This is the school I and my best friends attended.

5. This is the town the greatest leader of the country came from.

6. 14th February is the day lovers exchange their gifts.

7. Becoming rich is the reason so many people work like crazy.

8. A supermarket is a shopping center you can buy almost anything.

9. The day he arrived was very nice.

10. A plane crash was the reason I couldnt sleep last night.