Will, Be Going To or Present Continuous?

Category one

100

I ______ (play) Kahoot with Julia and Tim tonight. I have already prepared my cards

am playing

200

I don't remember when exactly, but definitely he _______ (have) an operation next week. 

is having

300

It's very cold. I _______ (light) a fire.

will light

400

_____ you ______ (watch) the match tomorrow at 5?

Are you watching

500

I think he ______ (study) law at Cambridge university next year.

is going to study

Category two

100

Tim ______ (meet) her old school friends on Sunday.

is meeting

200

My nephew ______ (come) to stay with me next week.

is coming

300

Sorry. I can't go on Sunday. I _______ (visit) my grannie then.

am visiting

400

Polina ______ (meet) Mary tomorrow afternoon.

is meeting

500

When _____ you ______ (visit) me next year?

are you going to visit

Category three

100

Alex's mom has just phoned to Alex to say that his father _____ (not come) back till Saturday night. So he can continue playing PS and do homework tomorrow!

is not coming

200

Tima and Alex  ______ (meet up) in New Riga this Saturday.

are meeting up

300

Julia_______ (travel) around Thailand this autumn.

is going to travel

400

We ______ (fly) to Madrid next week for our meeting.

are flying

500

I ______ (take) this letter to post office when I go into town this afternoon.

am going to take