When Jane began to take swimming lessons, her main ____ was the fear of water．

Pine trees, of which there are almost one hundred _____, are found throughout the North Temperate Zone.

The __________ rate has been rising in the past decade in China，________ is reported in a recent survey. People find it hard to maintain their marriage.

Foreign trade, the ____ of goods between nations, takes place for many reasons.

China has got a good ________ for fighting against the flu with its careful and smooth organization.