It ______ me all of a sudden that I had left my key to the car in the office.

Be sure to read the ________ on the bottle carefully and take the right amount of medicine.

—How do you like your new roommate?—He is too ________. He never shares his snacks with me.

_________ by the superstars on television, the young athletes trained hard and played intensely.

When he was young， he used to 　　　　 hard at his lessons.