We shouldn’t s0pent our money testing so many people, most of __________ are healthy.
| A．that | B．which | C．what&nze:1bsp; | D．whom |
John waited at the bus-stop for nearly half an hour the bus finally arrived .
| A．when | B．as | C．before | D．while |
Not that I’m unwilling to lend you a hand ,I’m too busy for the moment .
| A．because | B．but that | C．but | D．however |
Jack had traveled six miles across the Channel _____his engine failed and was forced to land on the sea .
| A．when | B．until | C．after | D．since |
—When did he leave the classroom?
—He leftyou turned back to write on the blackboard.
| A．the minute | B．the time | C．until | D．before |
he thought he was helping us with the work, he was actually in the way.
| A．Although | B．Unless | C．Because | D．When |