Mr. and Mrs. Black ______ back _________.
-_______ do I save the document on the computer? - Please click 'save' and write a name for it.
My sister spends as much time as she can_______.
His sister's never been to the Summer Palace, _______?
How careless you are! You_______ more careful next time.
The highway from Zunyi to Renhuai ________for about two years.