Ответ:

Для заранее намеченных планов используется be going to, а для предположений и решений, принимаемых в момент речи, — will.

Next weekend I am going to hike with my friend. I think the weather will be fine. We are going to stay in a tent. I am going to collect wood for a fire and Mike is going to make a fire. We are going to go fishing. I’m sure we will catch a lot of fish in the lake. We aren’t going to swim because the water will be cold for swimming. We are going to visit a farm festival in the village. We think it will be fun. Maybe we will buy some food there.

Ответ: 1) am going to; 2) will; 3) are going to; 4) am going to; 5) is going to; 6) are going to; 7) will; 8) aren’t going to; 9) will; 10) are going to; 11) will; 12) will.