You’re eighteen years old.You should ________ your family.

The water dark and dirty. It’s no longer safe to drink.

The mother, who is strict with her two daughters, has a clear list of ________ they are not permitted to do.

rry, but there is no smoking on this flight.—Oh, I _____that. Sorry, I won’t again.

Stop! You can never touch this machine when it ________, it is very dangerous