单项选择题

He began working with balloons______.

A．as a relaxation from his work on aircraft
B．as part of his job at the time
C．as a hobby
D．when he heard that some Americans had crossed the Atlantic in one

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单项选择题

The success of Don's business can be measured by the fact that______.

A．he has made 150 of the balloons in Britain
B．he now has enough orders to employ a number of people
C．he delivers balloons to France
D．he is going to move his factory to America

单项选择题

When he started his company, Don______.

A．spent most of his time on test flights
B．was mainly interested in designing balloons for advertising
C．worked hard, whereas now he relaxes
D．built the balloons at home