英语选择题,会的指点下,谢谢了1.We waitde more than half an hour for Beth b

英语选择题,会的指点下,谢谢了
1.We waitde more than half an hour for Beth but(eventually)we had to leave without her.
A.at last B.in the end C.afterwards D.relutantly
2.(As long as) you keep trying,you'll certainly succeed.
A.As B.Bause C.No matter how D.If
3.Betty was (nervous) whenever she saw her history teacher.
A.delighted B.relaxed C.disappointed D.tense
4_____that the left side of the human brain is responsible for
logic.
A.it generally is believed B.Tt is believed generally
C.It is generally believed D. Generally It is believed
5.Scientists did't know much about lung cancer______
A.before long B.until recently C.long before D.in the past few years
6.The_____power of the people in this town has been decreasing
because most young people have left for the big cities.
A.shopping B.purchasing C.enduring D.spending
请指点的人说明下问什么选择这个,谢谢了