The old man said the accident________ careless driving
________ the same mistake again made his parents very angry.
The police are________to conclude that the cause of fire had been a cigarette end.
I don‘ t know how to use a computer,_________.
His room needs _______,so he must have it ________.
It is in Qingdao _____ you‘ re going to pay a visit to ______this kind of washing machine is produced.