Remember to ask before you ________a cigarette if you are with a nonsmokers.
The pool should not be made so deep______small children can be safe there.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
The examination was not very difficult, but it was_____________________ long.
As a millionaire who liked to show off her wealth, Mrs. Smith paid______________________________________________ we asked.
He_______________us but he was short of money at the time.
We all agree that she is____________________ student in our class.
Michael looked deeply hurt and surprised when_____________________ .
__________ John Kennedy was elected president, he was the youngest American President ever.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
The phrase "keeps sellers on their toes" in the passage mostly means "______".