句型转换（每空0.5分，满分5分）
While I was walking along the street, the accident happened.(写出同义句)
__________ the accident happened, I was walking along the street.
To protect the animals, we can write some articles. (对划线部分提问)
_________ ________ we do _______ protect the animals?
Mike hopes to visit the Mars one day. (变成一般疑问句)
_________ Mike _________ to visit the Mars one day?
My hometown is big. His hometown is small.(合成一句)
My hometown is ________ ________ his hometown.
There are four ways to travel from London to Amsterdam. (对划线部分提问)
How many ways ________ _______ to travel from London to Amsterdam?