I was about to give up the project _________ it hit me _________ I could work with my roommates. That's to say, I can turn to them for help.
I thought things would get better, but _____it is they are getting worse.
Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.
John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
Not that I’m unwilling to lend you a hand , ____I’m too busy for the moment .
Jack had traveled six miles across the Channel _____his engine failed and was forced to land on the sea .