There is something wrong with your bike and you’d better _______ it _______ and repair it.
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 .
—When did he leave the classroom? —He leftyou turned back to write on the blackboard.