81. It’s really kind __________ you to help poor people. 82. He arrives __________ Singapore on Monday evening. 83. There is a meeting __________ 7 am
81. It’s really kind __________ you to help poor people. 82. He arrives __________ Singapore on Monday evening. 83. There is a meeting __________ 7 am and 9 am 84. It was hot, so I turn __________ the air conditioner.