[观察例句]
1．One theory was that bad air caused the disease.
2．The question is who will be the successful applicant for the summer job at the law firm.
3．Her confusion is whether she should stick to her own way of life or follow the American way.
4．What John Snow was determined to find out was why the 1854 outbreak of cholera in London could have caused over 500 deaths within ten days.
5．Taking a year off from school to travel abroad is what is generally called a gap year.
