Complete the sentences with will or be going to.
1) — What do you want to buy?
— I think I will buy some meat and vegetables.
2) — What are you doing tonight?
— My friend asked me to help him with the project. I__________ to visit him tonight.
3) — I want to invite you to my birthday party next Saturday.
— OK. I___________come.
4) — It’s very hot here.
— Well, I___________open the window.
5) — You bought so many apples. Why?
— My mother___________to make an apple cake.