Unit 3
单项选择。1. -- Could you please take care of my dog?   -- _____. I’m too busy.  A. Yes, you can    B. Sure    C. Sorry, I can’t
2. -- Could you please ____ his bed?   -- Certainly!  A. makes  B. making  C. make3. -- Could I use your car?    -- ______.  A. Sure, you can     B. Sorry, you can  C. Sure, I can