yes
Yes, "clean-up" is hyphenated when used as a noun or an adjective, such as in "the clean-up crew" or "a clean-up operation." However, when used as a verb, it is typically written as "clean up" without a hyphen. Always consider the context to determine the correct form.
It is not hyphenated.
Motorcycle is not hyphenated
No it's not hyphenated.
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
Yes it should be hyphenated.
No, "hardworking" is not hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.
China Clean Energy's population is 200.
China Clean Energy was created in 1995.
No. Well above is not hyphenated.