— Why does the boy keep crying?— It is ______ he has lost his favorite car model.
--- I wonder if I could pay the bill by check. --- ______. The card machine has just broken down.
You __________ football after school. Why not go home and do your homework first?
The palace is heavily guarded, because inside its walls ________.
Flying kites, ______ some researchers point out, can not only bring about joy to us, but also promote our physical and mental health.
Your daughter would ______ a famous singer---she has a great gift for music.