一、单项选择30分
( )1. If you arrive late _______ class, you must say _______ to your teac her.
A. for, thanks B. for, sorry C. to, sorry
( )2. — Can you sing in the classroom? — _________________
A. Yes, you can. B. No, I can. C. Yes, we can.
( )3. Don’t arrive late. You must be ________ time. A. to B. on C. at
( )4. Plea se listen _______ the teacher carefully (认真地). A. to B. on C. at
