选择适当的词或短语并用其正确形式填空

1. Lacking necessary money, the small companies ________ one by one during the economic crisis two years ago.
2. He is delighted ________ his driving test and now can drive a car on his own.
3. The magazine is meant ________ white-collar working women in their twenties and thirties.
4. The incident(事件) ________ a chain(系列) of events which led to the outbreak of World War II.
5. It is easy to make a promise, but difficult to ______ it ______.
6. We watched the street lights ________ one after another at dawn.
7. Various factors ________ the downfall of the government.
8. Women only ________ 30 percent of the workforce in that factory.
9. We should avoid ________ this kind of trick again.
10. At the present speed, the world’s oil supply will ________ soon.