The flowers over there _________ by the students last year.
—Look! A book is on the floor. Whose is it?—It ______be Rick's. It has his name on it.
—______ hard Tony is working!—Yes. We should learn from him.
It's 9:30 pm, children! ______ is time to go to bed.
Attention please. The plane will ______ in five minutes.
There are many flowers and trees on ______sides of the Century Road.