We should think of ways to stop the waste from the factory _____ our living environment

109. The information allows businessmen tokeep _____ of their list of goods by showing which items are being sold and howfast they are moving.

She got his salary____ last month[ ]

.Many parents think it will be of great use for their children to ______ from home and earn their own living.

As a child, Johnson would sit on thesteps alone, _______ the sun ______ down.