—Was ________ problem solved?—We were trying to think of ________ way out, but it was difficult to find one.
The boy was not allowed ______ his brother’s bike.
He _____ tasted the mixture and give a smile.
None of the students watched the teacher______.
Miss Yang will teach us Chinese today ____ Mr Zhang.
Johnny, you ________ play with the knife, you ________ hurt yourself.