三道英语选择题,请帮我选出正确答案,及说明原因,

三道英语选择题,请帮我选出正确答案,及说明原因,
Who was the first student to_ today?
Perer.He's always the first to _ school.
a.reach; get to b.reach:arrive c.arrive:get to d.get;reach
I think I should do what I can_him later?
You should._ more exercise is good for his studies.
a.help; do b.help;doing c.to help;do d.to help; doing
Would you mind going fishing with me?_
a.no,not at all b.yes i like c it doesn't matter