Some children don’t know ________ for their parents. 

—Do you know _______he came?—I am not sure.  Maybe for the toy car.

When it comes to a job interview, you really don’t know　　　you performed until you get the good-news call. 

You can’t imagine ______ when you read it in the newspaper.

—Could you please tell me_______?—Sorry, you can turn to Mr. Lee for help.