根据所给的句子在空白处填上合适的单词或短语,使两句意思相同或相近

根据所给的句子在空白处填上合适的单词或短语,使两句意思相同或相近
1.Be sure to turn off the lights when you leave.
____ ____ you turn off the lights when you leave.
2.Zhang Wei was badly ill,so he didn`t go with us.
Zhang Wei was badly ill;____ ____ ____ ,he didn`t go with us.
3.We will go for a picnic if it doesn`t rain.
We will go for a picnic ____ ____ ____ .
4.I prefer walking to riding a bicycle.
I ____ ____ ____ than ride a bicycle.
5.It was such an interesting book that I read it again and again.
It was ____ ____ ____ ____ that I read it again and again.