填空题

Splitting dinner checks can cause a splitting headache, even when the diners are mathematics majors. Three computer science (36) students at the US’s Carnegie Mellon University were (37) up with worrying about shared bills so they decided to act. Shashank, Amit and Ashwin created a free website, Buxfer.com, in September, to help people remember who (38) what and to whom.
Instead of trying to (39) out how every dinner bill should be split, the site allows users to form groups of friends or housemates to (40) shared expenses over longer periods of time. For example, if one housemate pays for dinner for everyone, he earns (41) in his Buxfer group and pays less on next month’s rent. Buxfer quickly became (42) among college students and young (43) who often pool expenses and borrow small amounts from each other.
News of the site has spread .largely by word of mouth and on blogs. (44) Buxfer automatically e-mails users about new transactions. When a user logs on to Buxfer, (45) Users can also leave notes for each other on the site.
Buxfer has been an eye-opener for Veda as it has shown him how much money was flowing between him and his friends. The site is helping him track US$300 that others owe him, (46)