一些英语问题,越快越好

题目

一些英语问题,越快越好
1、Henery killed the dog.I"ll ask him why _D__
A did he do that B he did that C he did D he hans done so
2 I am sure__D__he said is true.
A that B about that C of that D that what
3 Mary is __C__ someone might recognize her.
A afraid of B afraid about C afraid that D afraid for
4 They came to the conclusion__A__by a computer.
A that not all things can be done B because of not al things be done
C being not all things can be done D because not all things can be done
5 Why the explosion occurred was__D__the laboratory attendant had benn careless.
A for B because C since D that
帮我解释一下为什么选这些选项,分值很高的

答案