几道英语选择,希望大家帮帮,为什么那样选,希望理由越详细越好.（麻烦回答是标明题号）

几道英语选择,希望大家帮帮,为什么那样选,希望理由越详细越好.（麻烦回答是标明题号）
1.As she had lost the key to the door ,she could do nothing ＿＿wait for her father.
A.except B.expect that C.except to D.expect for
2.Charles Babbage is generally considered ＿＿the first computer.
A.to invent B.inventing C.to have invented D.having invented
3.Have you ever been to the factory ＿＿makes pocket radio?
A.where B.which C.in which D.at which
4.Margaret must have gone home,＿＿we cannot find her anywhere.
A.for B.but C.as D.otherwise
5.We should＿＿our teachers have instructed us in class.
A.keep in mind that B.keep it in mind that
C.keep in mind what D.keep it in mind what