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:
Country, range, & landforms
Explanation:
There could be types of countries, ranges, & landforms. It's not a proper noun (specific place/thing).
“Another tropical storm” is the complete subject. And the simple subject is “tropical storm”
Hope it works! Good luck:)