93．Officials began to look into the c_______ of the accident.

92．These m_______ and newspapers are not allowed to be taken out of the reading-room.

91．Twenty two hours Greenwich mean time. Here is the l_______ news on VOA.

90．The little child couldn't a_______ the school fees(费用). It was too high.

89．Finally I realized I was mistaken. I had to a _______to him for the wrongs I had done him.

88．The temperature there can fall to -36℃, that is 36℃ below f_______.

87．In the traffic accident ten were killed, and twenty were i_______.

86．The number of death was r_______ because of the invention of medicine.