American children customarily go trick-or-treating on Halloween.
Education in many countries is compulsory________the age of 16.
We all agree that she is____________________ student in our class.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
We must push the piano to the corner of the hall to_____________________ our party tonight.
_______ has been a topic of continual geological research.
__________ John Kennedy was elected president, he was the youngest American President ever.
The pool should not be made so deep______small children can be safe there.
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "
Regular exercise and good diet will bring______fitness and health.
I am sorry I have no time at present to____________________ detail of our plan.