On catching sight of his mother, the little boy ________ his grandmother and threw himself into his mother’s arms.[ ]

, what we have done is destroying the earth; only by changing we live we save it.

（2014年北京市西城区高三5月二模试题）33Based on a true story, the film shows a hero racing ______ time to get back the stolen papers

I ________ the History Museum twice. I’ve learned a lot there.

Collecting stamps ______ my father’s favorite hobby and reading novels ______ my mother’s favorite pastime.