—Where is my ruler?—___________A. Sorry, I don’t know.B. Yes, I know.C. No, it isn’t.
When the teacher asks him, he always ____.
Mr. Li makes me ____, because it is bad for my health.
Tom didn’t go hiking with his classmates ____ his illness.
Your mother prepared delicious food for us yesterday. Please say thanks ____ her.
Helen is 15 years old, and Joan is 15, too. So Helen is ____ Joan.