77. Unfortunately he had his house b _____to the ground last night.

76. A person 1 _________ in frankness (真诚) can never have a true friend .

75. Excuse me i ________you while you are busy , but there’s someone to see you .

74.We sent Mary our c _______when she passed her entrance examination .

73. It’s good manners to a __________to the teacher when you are late for class .

72. Be P________ --we can’t afford both a car and a holiday .

71. The sound of thunder f ________into the distance .