When a storm is just ________,we must fix up the roof to prevent it from________.[ ]

The government in china has ended its one－child ________ and let one family have two children.

Once new difficulties _________ in your work, it’s always important to use your brains

oving out of the twenties, we are givingyou a marvelous birthday party.

study of modern science, there aremany cases _____ soldiers can teach officers