помогите составить предложение со словом buy

I want to buy a T-shirt, because with out a T-shirt a can't go to the beach.

I buy things at the supermarket.

I bought a pen last Monday. 

We buy dairies every year, when we go to the schol at first after holiday.

I want to buy a pen. 

1)You have to buy tickets for the cinema.

2)Buy pet supplies online in our pet superstore buy pet supplies online at discount prices in our pet shop.

3)Buy with confidence at any of the stores we check.

4)My mum bought me a new coat.