China made its firm ____ to cut carbon emissions in 2009.

What happened over there— Oh, a girl down from a bike and hurt her left leg.

Does the girl ________ a round face—Yes, she does.

The news has spread all over the country ____ the spaceship succeeded in returning to the earth.

30. It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.