Mr Black has two sons, one of ________working as a doctor.
—Tom, you go to the station to pick up your father and I will cook the dinner. — ___________ I will go at once.
—What do you think of your step-mother? —There are some things that are not easy to______, but on the whole she is a good mother.
John rushed out in a hurry, ____ the door ____.
—Jack, _____ you behave yourself? You're no longer a kid. —Sorry, Daddy.It won't happen again.
Can you tell me ___ which you based your calculation __ detail ?