He speaks English ________ an American, so we all think he stays in America for many years.
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.
Theteacherspokeofsomewritersandsomebooks________we need to know.