—I suppose you need more people to do the work.—Don’t you know “Three helping one another _________ the load of six”?
I earn 10 dollars _____ hour as _____ supermarket cashier on Sundays.
As a result of destroying the forests, a large _____ of desert _____ covered the land.
David helps his mother with her housework every Saturday for about _____.
Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
20.Tell John not to leave the house unless he_____________that the lights .