Farmers in China began to use tractors _______ cattle for farming work.

______ does Jim get to school—He usually ______ the bus.

We were required not to ______ any important details before they were made public.

“Power sleeping” for more hours on weekends is only a _______ solution. There is no substitute for getting a good night’s sleep on a regular basis.

May I tell this to my close friend?— No, you___________. Never let anybody else know about it.