"Field" is not hyphenated.
Yes it should be hyphenated.
No it shouldn't be hyphenated.
It should be hyphenated.
It should be hyphenated.
It should be hyphenated.
Yes it should be hyphenated.
No it shouldn't be hyphenated. It is one word.
No it's not hyphenated: biweekly.
No it doesn't need to be hyphenated.
Yes, open-ended should be hyphenated
The second word should not be capitalized
Underdeveloped should be written as one word, not two words or hyphenated. I hope this answered your question. :)