Until he told me yesterday,I knew______of what had happened to him .

—Don't be angry with your kid when he makes a mistake again, will you?—No, I won 't.  I know  that     of us  are perfect after all.

 She asked if any of the passengers knew _____ about machines or at least how to drive a car. 

Annoyed by the salesman’s bad manners, John chose       of the two computers on sale and left．

Determination is a kind of basic quality and this is what________ takes to do jobs well.