I was so familiar with him that I recognized his voice _______ I picked up the phone.
Mrs Brown was much disappointed to see the mobile phone she had had______the week before went wrong again.
I’m examining the composition he has just finished______the possible mistakes in it.
You can’t guess ______ when he was admitted by Beijing University.
As teachers, we feel______our duty to teach our children to be good wherever we are.
— Each of the students, working hard at their lessons, ______the book. — So have I.