---Have you heard about Volunteer? ---Sure, A volunteer is someone _________ is willing to offer help without being paid..
It’s time _____ class. You must _____ the classroom.
Lily is her pen, but she can’t it.
—Lucy, do you go to the park?—Three times a week.
---How do you usually go to school?----________
I’ll give you a call if he _____ tonight.