Ответ:

Will-это лёгкая мысль

Going to-планировать(что то серьезное)

Мы используем Will(future simple) когда мы просто думаем,в то время как going to используется когда вы планируете.

1.She's very sensible.I know she will forget her train ticket

2.We haven't got much money,so we decided that we going to a holiday this year

3.Are you going to stay in a luxury hotel?

4.Be careful !You will spill your drink.

5.It isn't a luxury hotel,so I don't think it will have a big swimming pool.

6.The holiday was terrible. I've complained to the travel agent and we going to get our money back.

7.I think they will built hotels in space one day.