You may easily lose your way in Shanghai ______ you don’t have a map or a guide.

We have some boxes. But we need ________ .

Though all of us hate Chinese style road crossing, there are still ______ people crossing the road when traffic lights are red in Yancheng. It must be changed.

Justin Bieber is ________ Canadian singer and he has lots of fans.

I have a lot of vegetables,________ carrots,potatoes,and so on.[ ]