Leaves are found on all kinds of trees, but they differ greatly _____ size and shape[ ]

One possibility is that tears get rid of certain chemicals from your body _____ build up during stress.

They can’t go out to workthe heavy rain.

These stories are about the everyday life of ordinary people who the great dangers in China over the past few years.

What _____ Yu Ping usually _____ in her free time—She usually goes to the library.