Where are my shoes? I can’t ________ them now.
( ) -- 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.