21．Usually there might be a lot of accidents in the heavy fog．I happened to witness ．this morning
A．it B．those C．each D．one
22．—What would you like to do next? Go skating?
—Well， 。I hate to be black and blue all over．
A．That’s the last thing I’ll do． B．It’s up to you
C．I can’t agree more． D．You can say that again!
