You really should do #7. You should write out your amount so that there is an actual record of what you meant. All checks are processed by computers and human eyes. The computer looks at the number and "assumes" what you meant. If there is a problem the amount is rejected or the wrong amount goes in. If there is a discrepancy, you want Four Thousand Three Hundred & Fifty-two dollars xx/100 to be clearly understandable so that you, the bank, and the merchant know what you meant. Sometimes numbers are not easy to figure out, even after you wrote them yourself.
But the rest are pretty good. : )
cl