1£®John was dismissed last week because of his casual attitude  to/towards his job.

2£®You can leave the work in the charge of him£¬for he is always cautious(caution)about everything£¬and never makes any mistakes.

3£®—Jack got drowned in the lake and was in hospital yesterday.

—Sorry to hear that.I'm told he often goes swimming alone regardless of his mother's objection.

4£®We are at your service.Don't hesitate to turn(turn)to us if you have any further problems.

5£®—Have you heard of the news that some bad guys set fire to the city hall and caused a lot of damage last night?

—Yes£¬and I'm wondering how the police will respond  to the accident.