—When I am walking in the street,I________some ads every time. —So am I.I hate it.It’s a waste of paper.
--________ does your father visit your grandparents a week? –Once.
--________ do you have PE? –Every Monday, Wednesday and Friday.
We have to work for ________ to finish the work.
The sea water is _______ for anybody to ______.
The plane couldn’t take off on time _____ the heavy rain.