Air pollution will get worse and this will do________to people,for example,it can cause cancer.
He is a strict but kind-hearted father, __________ the children respect but are afraid of.
The reason __________ he is late is __________ there was a breakdown on the railway.
Rabbits make their homes in fields and prairies __________ they can hide their young under bushes or grasses.
The beautiful mountain village __________ we spent our holiday last year is located in __________ is now part of Guangxi.
In China,the number of cities is in-creasing __________ development is recognized across the world.