Ответ:

0. Mum wants to have the best garden in the street, so she is going to plant (plant) many flowers in spring.

1. We (will) fly to Italy this summer but we have to find some cheap tickets first.

2. X: Do you know that we (are going to meet) at the Grand Hotel tonight? Y: Yes, I've just read an email from Gina.

3. John thinks he (will study) architecture in the future.

4. Can I call you later? We (will have) a meeting in fifteen minutes.

5. X: I can't move this box. It's too heavy. Y: Don't worry. I (will help) you.