Doing some __________ every day is good for your health .

The dog has a(n) _______ sense of smell while the rabbit has a sharp sense of hearing.

_ the average age of the population increases, there are more and more old people to care for.

It was April 29,2011 _______ prince William and Kate Middleton walked into the palace hall of the wedding ceremony[ ]

When Helen saw his tutor nod ________ to her, she calmed down and went on with her performance