A recent survey shows that the number of children who       from the countryside with their parents       ________nearly 320,000 in Beijing.

—_____________ do you visit your grandparents?—Twice a month.

The number of people invited ___fifty, but a number of them____ absent fordifferent reasons．

--- How _____ hours do you sleep a day?--- Well, about eight hours. But how _____ sleep do we students really need?

Look at the poster! There ______ a speech about Canadian culture in our school next Saturday.