So quickly is science and technology advancing ______ is a possibility today may be a reality tomorrow.
In class the teacher’s humorous words often make every student ____ laughter.
Look out! Don’t get too close to the house ______ roof is under repair.
The teacher said that Columbus _______America in 1492.
—When Tom________,please let me know.—Mary said when Tom________,just tell her about it.
—If you like the model car, you can _____ it. I don’t want it.—Thank you very much.