急用！！！求此英语短文改错解析When Mr. and Mrs. Smith went to theatre, they

急用！！！求此英语短文改错解析
When Mr. and Mrs. Smith went to theatre, they left their German dog to guard his home. When two burglars broke into and the burglar alarm rang, the dog was waiting for them. Unfortunately, one of the burglars was dog-lover, and he quickly made friends with it. While the alarm was ringing, but the burglars were stealing cash and jewelry, worth over $10,000, from a safe, the dog laid down in his basket and went to sleep. When the police arrived at twenty minutes later, the burglars had gone. The dog was proud guarding the empty safe. When the first policeman entered into the room, it immediately attacked him, tearing his trousers and bit him in the