The key to exercise solutions in chapter 3c - Grammar in use for the textbook On Screen B1+ - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing
Question
Fill in: will or am / is / are going to.
Answer
are going to (already decided)
will (prediction based on what we think / believe)
will (prediction based on what we think / believe)
will (prediction based on what we think / believe)