Don’t touth anything unless _______ .
---You should say sorry to her, Tom.--- ______, but it’s not going to be easy.
Most pop music is influenced, ________a greater or less degree, by the blues.
Used to________ his car in all kinds of weather, he is really a good driver.
QQ, ________you can chat with your friends, makes communication easy.
-----What do you think of the play ? -----Terrible! I have never seen________one.