They haven’t seen each other for ten years, but they still keep in___contact with each other.
— When can I see you, Mr Black? Three o’clock this afternoon? — Oh, no. I ________ a meeting then.
Wait till you are more ________. It’s better to be sure than sorry.
The hotel ____ 50 yuan for a room for the night.
You can take as many books as you like here for they are free of ________.
The army officer ___ his men to fire as soon as the enemies came up.