Yes. In-between requires a hyphen.
Can you, or should you? You can hyphenate it if you're moving between lines in a paragraph and need to break up the word. You shouldn't hyphenate it normally.
Don't hyphenate; ongoing is one word.
You hyphenate it only at the hyphen.
I think it's more accepted to hyphenate it.
You do not need to hyphenate.
You do not hyphenate the number.
The hyphen would be located between the mid and the century.'Mid-century'.
You would hyphenate "thank you" when it is used as an adjective before a noun, such as in "a thank-you card."
You mean at the end of a line? Well it depends on how much room you have hyphenate at a syllable is probably best. If you have little space before the end of the line don't hyphenate a word. You could hyphenate like this trans- portation.
No...
If you absolutely must hyphenate a word at the end of a line then you should do so between syllables (and not in the middle of a syllable) to ensure meaning remains intact. A good way to hyphenate this word would be: investi-gation.
You can hyphenate 3 bedroom when it is used in a list. It is usually not hyphenated when it is used by itself.