31. We______ on the project for three hours. Let’s have a rest.
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.
69. It is raining cats and dogs. This sentence probably means _____.