( ) was fun! A. They B. It C. We
-- What can I do for you, madam? -- I'd like two ______.
-- Hi, Mike. Can you help me? -- OK. ________.
Even the top students in our class can't work out this problem. So it _____ be very difficult.
This machine is very easy to use.______ can learn to use it in a very short time.
One of his friends ______ his daughter sometimes.