The Changjiang River is one of ________ in the world.

I think that we should produce more things from materials that have been recycled, and less from raw materials, __________ is growing smaller and smaller.

The last time I _______ Jack, he _______ football with classmates

Wechat really makes ________ easier for people to keep in touch with each other.

Do you feel like ______ out? — No. I’d rather we ______ a taxi.[ ]