If I watch the animals ______, I'll get ______for my class report.
— It’s raining. When did it start?— As far as I know, it ____ for three hours.
I _______ the CDs to you if I have time tomorrow.
— What are the neighbors doing, Joe?— Oh, they _______ a party.
Our English teacher, Mrs. Black, ________ in our school since 1992.
The Olympic Games ________ every four years.