5 . Just as he finished the first few bars, one of the strings on his violin broke. We thought that he would have to stop the concert. ________ everyone’s expectation, he waited a moment, closed his eyes and then signaled the conductor to begin again. (用适当的词填空)

7 . 由于工作时心不在焉，约翰被老板解雇了。(汉译英)

8 . Over-exercising is very dangerous ________ it adds too much burden to the heart.

A．even if

B．although

C．because

D．unless

9 . 考虑到这些参考书因维护不利，已破损不堪，请务必在每一本上贴上条码，以便归档和后续追踪。(file) （汉译英）

10 . 人们没有因为人手短缺而中途放弃这个项目，博得了大家的尊敬。(command) (汉译英)