How long ago ______ to learn French?
The boat was sailing north when a terrible storm_____________ .
Michael looked deeply hurt and surprised when_____________________ .
_______ has been a topic of continual geological research.
He_______________us but he was short of money at the time.
The pool should not be made so deep______small children can be safe there.
As a millionaire who liked to show off her wealth, Mrs. Smith paid______________________________________________ we asked.
Regular exercise and good diet will bring______fitness and health.
It is stated in the passage that____________________ .
__________ John Kennedy was elected president, he was the youngest American President ever.
The phrase "keeps sellers on their toes" in the passage mostly means "______".