用关系代词或关系副词填空

1. I met the man at the street yesterday _____ wrote the book.

2. Is this the way _____ she does her homework?

3. This is the last book _____ I like to buy.

4. I climbed up the hill on _____ top there were many trees.

5.This is the house _____ we used to live in.

端午节举行龙舟大赛．开始阶段甲队落后于乙队．甲队急起直追．从甲队船头追上乙队船尾到甲队船尾超过乙队船头，共历时80秒．已知两队船长均为10米，乙队划船速度保持为7米/秒不变，甲从超越乙队的过程中船速也不变，那么甲队超越乙队时船的速度为______米/秒．