___ is left over may be put into the refrigerator, ____ it will keep for two or three weeks.
The government has to close those small factories to prevent the water of the river ______.
He wants to see changes in the company and I am sure he will, ______.
We should try our best to ______ those people after the disaster.
_________ he stayed in Germany for half a year and he will go to Germany _________again.
—Catherine, I have cleaned the room for you. —Thanks. You_______ it. I could manage it myself.