单项选择题
A．By doing odd jobs at weekends. B．By working long hours every day. C．By putting in more hours each week. D．By taking shorter vacations each year.
A．It can reduce the number of passenger complaints. B．It can make air travel more entertaining. C．It can cut down the expenses for air travel. D．It can lessen the discomfort caused by air travel.
A．He enjoys finding fault with exams. B．He is sure of his success in the exam. C．He doesn’t know if he can do well in the exam. D．He used to get straight A’s in the exams he took.