I don’t know the reason _______ you were absent from the meeting, and I am not sure that someone will tell me the reason _______ you haven’t told me.
64. I suggest you having plenty of exercise instead of playing _____ day and night.
65. We should roll _____ for the distinguished visitors in five-star hotel.
66. Put on your raincoat, _____ it rains.
67. ---I have no ______on me. May I pay by cheque? ---Sorry, only by credit card
68. Mind you. Don’t bump your head on the low________when you go upstairs for sleep.