Nanjing is one of _______ in China.
— Generally speaking, light ___ faster than sound. — Yes, it is a rule.
–Is Miss Green in the office?--No, she ____ to the library.
-A nice tie! A present?-Yes, it is. My aunt it to me for my last birthday.
—I didn’t know .
—What should we do with the driver hurt in the car accident?—Let him stay . Help is on the way.