—Are you interested in learning math?—Yes, but I’m afraid to _______ too much time on math.
He is highly praised _______ the teacher _______ his hard work.
I will perform _______ the piano in the concert to be held tonight.
His actions _______ his thoughts.
It’s easy for David to find the library because of his good ______ of direction.
There were some cases ______ women employees were fired when they were pregnant.