The correct version of these two sentences when combined is:
When we were in Europe on vacation, we usually flew on airplanes: however, sometimes we took the train.
We apply the semi-colon to indicate that they have different ideas, and that they are clauses being joined into one sentence.
Answer:
If it were me, I'd pay attention to the speaker's gestures and facial expression. It's not in here, but I'd also include the tone of their voice.
Explanation:
Imagine, if you were listening to someone give a speech and they stood there with no emotion or movement, you're most likely not going to pay much attention to that person. In order to get the audience involved, it's best if the speaker gives some kind of gestures and feelings to get a response from the crowd. Make sense?
I hope this helps! Have a good day!