I don’t know much about computer.—I don’t know, ________. Let’s go and ask for help.

Americans eat ______ vegetables per person today as they did in 1990.

Jack could have avoided that terrible car accident, but he ________ careful enough.[ ]

I don’t think it is ______ good idea to go to school without ______ breakfast.

The couple ______at this time yesterday.Nobody knew when they stopped.