I have been told that more than one answer is possible in several of the questions in this test. Could anyone tell me which questions are they?


Is it number 4? I know that present progressive form, be going to, simple future form, and present simple (for a scheduled event) can be used there. For example;
On Sunday at 8 o'clock I meet my friend. (I remember a similar example where it was used for a scheduled event). Maybe in questions number 5 and 2 it's the same.
Maybe in questions number 4 and 5 I could use present simple form to express the idea that the action is a part of a scheduled event, and in number 2 I could use present simple to show that the action takes place regularly? (hmm, but in this case there must be 'every Saturday'.. ),
I really wonder if I can use present simple form in the second sentence to show that it's a regular action or a scheduled event.
Yes, there are many possible answers. Most of them can easily accommodate two futures, and certain contexts could accommodate even more. I have entered the most common ones:

1) The train leaves / will leave / is leaving at 11:45. (to leave)
2) We are having / are going to have dinner at a nice restaurant on Saturday. (to have)
3) It will snow / is going to snow in the mountains tomorrow evening. (to snow)
4) On Sunday at 8 o'clock I will meet /I'm going to meet / I'm meeting my friend. (to meet)
5) They fly / are flying / are going to fly / will fly to London on Friday evening. (to fly)
6) Wait! I will drive you to the station. (to drive)
7) The English lesson starts / will start / is going to start at 8:45. (to start)
8) I will see / am going to see my sister in April. (to see)
9) Look at the clouds - it is going to / it will in a few minutes. (to rain)
10) Listen! There's someone at the door. I will open the door for you. (to open)

PS: I scored only 8/10 on that quiz!