几题英语填空题(急)

题目

几题英语填空题(急)
请朋友们帮我选下答案并解释一下为什么选它,谢谢大家!
1.I have not found my book yet. I"m not sure ______ I could have done with it.
A) what B) whether C) how D) where
2. ______ he realized it was too late to return home.
A) Hardly it grew dark than
B) It was not until dark that
C) Scarcely it grew dark than
3.I hope my teacher will take my recent illness into ______ when judging my examination.
A) account B) observation C) regard D) counting
D) No sooner it grew dark when

答案

B B A