Although Happy World was able to find a new supplier or manufacturer, the circumstances surrounding how that arrangement was reached had its own...

Although Happy World was able to find a new supplier or manufacturer, the circumstances surrounding how that arrangement was reached had its own unique problems. Originally, the manufacturer was contacted by telephone, and the contract was entered into over the telephone. This presented a problem because both Happy World and the new manufacturer are merchants, and the agreement was for the (18) it was covered by the (19). This meant, of course, that the agreement had to be in writing, and if not, the telephone agreement could be (20) by the new manufacturer. If this happened, Happy World would still have to pay for the reasonable value of goods received. The legal arrangement would be considered to be a (21), and the amount Happy World would be required to pay for the goods received would be determined by the legal concept of (22), because if it did not pay that amount, it would be (23).  

Answers from 18- 23 please