They often leave the boy alone at home. They think that he’s old enough to look after _____.
—Dinner is ready. Help yourself, please!—Wow! It ________ delicious. You are really good at cooking.
As a student, we should keep our classroom ________.
Some children prefer to eat junk food ________ it’s not good for their health.
—Oh, it’s too difficult for me ________ the work in such a short time.—Anything is possible if you put your heart into it.
—Alan, don’t ________ too late, or you will feel sleepy in class.—Sorry, Mrs. Black. I won’t do that again.