A deficiency of vitamin D can lead to permanent bone deformities.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
Supporters of free-market globalization point out that_____________________ .
Regular exercise and good diet will bring______fitness and health.
_______ has been a topic of continual geological research.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
I am sorry I have no time at present to____________________ detail of our plan.
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "
__________ 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 packages___________________ so that it would be easier to carry them.