After trying hard, they _______ the hope of finding an effective way to solve the problem.
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 .
—When did he leave the classroom? —He left _____you turned back to write on the blackboard.
____he thought he was helping us with the work, he was actually in the way.