Learn new grammar!
Complete the sentences with be going to or will

Dear Arthur,
Thanks for your letter. You asked me if I have an advice for you, well I have.
  First of all, you should know what your friend likes. For example, if your friend is fan of pens, pencils etc. then buy him unique pen/pencil. If your friend likes LEGO or toys, then buy him LEGO set. If your friend fan of Star Wars, then buy him a glass or T-shirt. But for everything I put in this letter upper can walk into shadows once I'll tell you, that best gift on birthday is book. Interesting book... With surprise inside of it. For instance, money. You can put $10 inside of the book. It'll be good surprise for your friend.
  Well, anyway I have to go now. I'm looking forward for your letter.

Bye,
Someone (тут должно быть твое имя)

1. If the car (is) out of order again, you (will have to) call the service station, but I doubt if they (will be able to) serve it very quickly. 2. Nobody (knows) what (will happen) in ten or twenty years if life (gets) tougher and tougher. 3. I wonder if they (will turn) to us if any need (arises). 4. My little son (wants) to know if there (will be) some cartoons on TV on Saturday. If there (are) some, he certainly (will watch) them. 5. Everybody (is interested) if the weather (will change) for the better next week. 6. I (will leave) a message at the office in case the customer (phones). But it's difficult to say if he (will do) it today. 7. He (wonders) if Caroline (will change) her mind about going to the party. If that (happens), he'll be really glad. 8. Nobody can definitely tell us when he (will come) back from London. But as soon as he (returns), we (will get in touch) with him. 9. If Linda (wants) to learn Italian, she (will have to) attend a special course. I wonder if it (will cost) her a lot. 10. We (will have) the meeting this week, provided no one (objects). 11. I will always be by your side as long as you (promise) to listen to me. 12. Do not (speak) to her unless she (speaks) to you first.