It is our duty _________our hometown clean and beautiful. We must do something for it.A. to keep B. keeps C. keeping
–Why don’t you choose the red tie? --For me, it doesn’t _________ my shirt very well.
–Are you scared of the flight? --No, just a little ________.
–Look at that girl! Is it Susan? --No, it _______ be her. She has gone back to her hometown.
–Would you mind my using your dictionary? --__________.
–Thanks for your help. --_________.