They are known that colds can be avoided by eating the right kind of food and taking exercise regularly.
_______ has been a topic of continual geological research.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
It is stated in the passage that____________________ .
__________ John Kennedy was elected president, he was the youngest American President ever.
Michael looked deeply hurt and surprised when_____________________ .
Standing on the tip of the cape,____________________ .
I am sorry I have no time at present to____________________ detail of our plan.
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: "______ "
Only one of our gifted students______to participate in the final competition.