10道英语介词选择题.

10道英语介词选择题.
请问选什么?为什么?（主要是为什么,因为我有答案）
(1)The teacher is writing ___a piece of chalk on the blackboard while the student are writing ___ink in exercise books.
[A]with/in [B]in/with [C]in/in [D]with/with
(2)Mary dropped in___Mr Smith,but he wasn't at home ,so she went to drop in ___Mr Smith's office.
[A]on/on [B]at/at [C]on/at [D]at/on
(3)The teacher is not only strict___his pupils but also strict___his own work.
[A]with/with [B]in/in [C]in/with [D]with/in
(4)His grangfather died ___the wound that the enemy soldier had given him and then his grandmother died ___hungry and cold.
[A]from/of [B]of/from [C]from/from [D]of/of
(5)If you run ___two hares you will catch neither.
[A]into [B]after [C]off [D]out of
(6)___hearing the news,Iwas wild___joy.
[A]At/in [B]On/with [C]After/by [D]空/over
(7)I don't think Xiao Li is___the other students___mathematics.
[A]after/on [B]after/with [C]behind/in [D]behind/at
(8)It happened ___the Long March.
[A]during [B]in [C]at [D]for
(9)We go to school ___a bike.
[A]in [B]on [C]by [D]over
(10)The boy is waiting___his sister and they will go to the hospital to wait ___their sick mother.
[A]for/on [B]on/for [C]for/for [D]on/on
请问选什么?为什么?（主要是为什么,因为我有答案）