过去
Her hair and coat were wet because it _____.
Her hair and coat were wet because it \_\_\_\__.
下列关于生产者物价指数（PPI）和消费者物价指数（CPI）的说法，正确的是（ ）。
下列关于生产者物价指数（PPI）和消费者物价指数（CPI）的说法，正确的是（ ）。
Only when we hurried to the airport _____ the flight was cancelled.
Only when we hurried to the airport \_\_\_\__ the flight was cancelled.
The main topic of the passage is _____.
The main topic of the passage is \_\_\_\__.
It is implied in Paragraph 2 that years ago governments _____.
It is implied in Paragraph 2 that years ago governments \_\_\_\__.