–We can use this special pen to record or take pictures. –Really? Will you please show me _______ it? A. how to use B. what to use C. why to use
My mother told me _______ junk food at school.
There 's a teacher _____ with your parents in the teachers' office.
That computer_____ me quite a lot of money.
I never forget the days when I enjoyed ______ a good time in Beijing.
We shall never give up ______ for even one day.