Where is my basketball?—It’s ______ the table ______ the floor.[ ]

Look! A book is on the floor. Whose is it?—It ______ be Rick’s. It has his name on it.

________5 :30 yesterday, they had finished the work.[ ]

The man called his professor for help because he couldn’t solve the problem by _________.

Tom often makes his brother___but yesterday he was made___ by his brother.