单项选择题
Generally, it takes courage for an aged person（）a new life in a strange country.
A．beginning B．began C．to begin D．to have begun
单项选择题 （）you choose to contact us, you can expect our efficient and helpful service.
单项选择题 People invest money in this company（）they believe it will make profits.
单项选择题 As a public relations officer, you should know your customers（）detail.
