---How often do I need to feed the birds?---They______ food every day, or they will be hungry.
What ____________ at nine o’clock last Sunday morning.?
An earthquake _______at Dachaidan County in Qinghai province on the morning of April18.
No one knows ____________ in fifty years.
There is going to_________ a football game on TV this evening.
My father will be back ______ the morning of May 15.