Mr. Black _____________ Shanghai in a few days. Do you know when the earliest plane __________ on Sunday?
________ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
We agreed to accept ________ they thought was the best professor in the college.
I don’t know who invented ________ telephone. It’s really ________ most useful invention.
In hot weather, an old tyre can break again easily it’s mended.
____ he grows up can he understand your intentions.