Mr. Jobs together with others started the company Apple Inc. in 1976 and made it a technology__________.
A.inventor B.engineer C.pioneer D.fighter
When you see your right moment，you __________let it pass you by.
A.need B.needn't C.must D.mustn't
Boys and girls，you should be __________to avoid making mistakes while taking the exam.
A.too careful B.careful enough C.too careless D.careless enough
There's no snake that will habitually（习惯性地）attack humans__________ it is in danger.
A.unless B.if C.though D.since
It's reported that Xiangshui explosion（爆炸）__________78 persons and the doctors are trying their best to save the wounded.
A.kills B.has killed C.killed D.had killed
—Who helped you with your poster，your father or your mother？
—__________. They were too busy，so I made it by myself.
A.None B.Neither C.Both D.Either
