I have some problems with " Will " and " Be going to " . Help me to choose .?

1. 'Excuse me, waiter! This isn't what I ordered. I ordered a chicken `Sorry, sir. I ........ this back and get your salad.'

b. will take c. am going to take

2. 'Robert ............ famous someday. He has appeared in three movies ready.' `1'm sure he .......... a star.

a. will be/ will be. b. will be/ is going to be

d. is going to. be/ will be

3. The Taylors ............ on a cruise around the Mediterranean to celebrate 50th wedding anniversary.

a. are going to go b. will go c. are going

4. If coastal erosion continues to take place at the present rate, in another years this beach ............ anymore.

a. doesn't exist b. isn't going to exist

c. isn't existing d. won't be

5. Scientists are predicting that the disease ......... over half a million over the next ten years.

a. Will affect b. is affecting c. is going to affect d. is to affect.

6. !Could someone help me lift the lawnmower into the pickup truck-. `I'm not busy. I .......... you.'

a. help b. will help c. am going to help d. am

7. 'Can I borrow your car?' `Sure. You can borrow the car provided that you .......... it back be o’clock.'

a. bring b. is bringing c. will bring d. is to

8. .......... anything tomorrow evening?' `No, I'm free. Why?'

a. Will you do b. Are you doing c. Do you do d. Won't you do

9. 'Would you like tea or coffee?' 'Oh, I .......... coffee, please.'

a. am going to have b. have c. will have d. am having

10. you have a piece of cake'?' `Thank you.'

a. Do b. Would c. Can d. Will

11. 'Well, I'd better hurry. My lesson .............. at half past seven, and it's twenty five past now.' `OK. Let's go.'

a. starts b. will start c. is starting d. is going to start

12. 'Why did you buy so many tomatoes`?' `I ......... a lot of spaghetti sauce.'

a. will make b. am going to make c. make d. am making

13. Although it is a problem only in Britain at the moment,/ think it the rest of the Europe soon;

a. affects b. will affect c. is going to affect d. is to affect

14. The firework display, part of the city's centenary celebrations, ............ place on the 21st August in Cannon Park.

a. will take b. is taking c. takes d. is going to take

15. 'Wow! This suitcase is heavy,' `I ......... it for you. Give it to me.'

a. will carry b. am carrying c. am going to carry d. carry