--Are you hungry? --Yes, .A. you are B. I am C. she is
( )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.
( )The game is _____ funny that many of them like it.
( )Are there _____ trees behind the house?