Problems with future again :(

Ok here are some other problematic sentences. The taks is to choose the most appropriate answer.

1.Jack is / is going to be sixty-five next month, so he retires / will be retiring.

2.Quick, here comes a police car! What will we say / are we going to say about the broken window?

3.Helen and Andrew are due to separate / are on the point of separating.

4.Don\'t be impatient! I’ll just come / I\'m just comming.

5.I have to be back at 3.30 so I’m leaving / I leave before lunch.

6.What do you think you will be doing / will do in 5 years time?

7.Come on, get a move on or we’ll miss / we'll have missed the train!

8. Will you be working / Will you work the week after Christmas? I was thinking of visiting you.

9.By the time Jim gets back, it'll be / it will have been too late.

10.Don't phone after 11.00. I’ll be/ I'll have been asleep.

And here are the answers plus my interpretation. Please help :

1.Jack is sixty-five next month, so he will be retiring. (is-because it is something we can't control; but why going to is impossible ? The second part of the sentence is Fututre Cont ? and present simple is not correct ? As far as i know you can use present simple to express something that you can't control and 'retire' is something we can't control?

2.Quick, here comes a police car! What are we going to say about the broken window? (ok why WILL is impossible ? if it is on the spot decision it could be possible ? I think that going to expresses something immediate ?

3.Helen and Andrew are on the point of separating. (DUE TO we use it when we talk about scheduled time so it is impossible here)

4.Don't be impatient! I'm just comming. (hmm... why only continuous ? WILL - > ON THE SPOT DECISION so it could be possible i guess ?

5.I have to be back at 3.30 so I’m leaving before lunch. (ok . here i have no idea continuous because i talk about definite arrangement . but present simple can be used when referring to time tables ?

6.What do you think you will be doing in 5 years time?(why WILL YOU DO isn't correct ? it expresses something that may or may not happen ?

7.Come on, get a move on or we’ll miss the train! (well perfect is not possible for sure)

8. Will you be working the week after Christmas? I was thinking of visiting you. (again . why not WILL ? Future continuous refers to something that is part of our routine or something that will just happen as natural course of events . but WILL would sound ok i guess)

9.By the time Jim gets back, it'll be too late. ( i am reallllly sad . Why can't we use Futurte Perfect ? We use it with BY-PHRASES ?

10.Don't phone after 11.00. I’ll be asleep.(here i have no idea . Why perfect is impossible ?)

Please help me