Future : will vs going to

Q1. I think it ______ rain tomorrow.

Q2. Look at those dark clouds! It ______ rain.

Q3. I ______ visit my grandparents next weekend. I've already bought the train ticket.

Q4. The phone is ringing. I ______ answer it.

Q5. She has made a decision. She ______ study medicine.

Q6. I promise I ______ call you when I arrive.

Q7. We ______ have a party next Saturday. Do you want to come?

Q8. It's very cold in here. ______ I close the window?

Q9. I'm sure you ______ enjoy the film.

Q10. He ______ travel to Japan next year. He's been saving money for months.