— It was careless of you to have left the house without turning off the gas.— My god! _______.
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.