What comma should be used in the sentence: "Under the circumstances we definitely feel that we have justification for this action."?

What comma should be used in the sentence: "Electricity is the most versatile and efficient form of energy but it is also the most mysterious."?

What comma should be used in the sentence: "If you would like to know more about our home insurance program invite our district representative to visit you at your convenience."?

What comma should be used in the sentence: "When your travel plans are definite please let me know."?

What comma should be used in the sentence: "I have to do two things - I must collect the money that is due us and I must try to keep a customer's goodwill."?

What comma should be used in the sentence: "As we expect to have a busy winter we suggest that you make your reservations as soon as possible so that we can give you just the accommodations you want."?

What comma should be used in the sentence: "I hope Mr. Garcia that you will have an opportunity to visit our showrooms in the near future."?

What comma should be used in the sentence: "They want to know about prices guarantees and many other items."?

What comma should be used in the sentence: "Thank you for your letter requesting permission to quote from our new book Business Correspondence Today in the manual you are preparing."?

What comma should be used in the sentence: "Yesterday I received a telegram from Ms. Maria Green manager of our personnel department saying that Mr. Charles Edwards will retire soon after more than 30 years as a successful correspondent with our newspaper."?

What comma should be used in the sentence: "Thank you for your order of Saturday December 15 for a copy of the Executives Correspondence Manual."?

What comma should be used in the sentence: "We feel that the Queen Anthology is in good capable hands."

What comma should be used in the sentence: "If it is more convenient you can order a copy by returning the attached order form in the enclosed envelope along with your check for $8."?

What comma should be used in the sentence: "We are with some justification exceedingly proud of this extraordinary record."?

What comma should be used in the sentence: "When you return from Europe please call me and we will have lunch in our new sub service restaurant which you will find is a unique dining experience."

What comma should be used in the sentence: "As you can see this valuable new program will be of great importance both to you and to us."?

What comma should be used in the sentence: "Good business letters run the result of an accident nor our they the monopoly of a chosen few."?

What comma should be used in the sentence: "Your real moment of triumph will arrive when you find yourself writing letters signing them and dropping them in the mailbox."?

What comma should be used in the sentence: "As you probably know we have just placed this calculator on the market."?