Everything to do with ______ nature can have______ important part to play in the development of man.
The teacher always waits until all the children _____before he starts the lesson.
---You were brave enough to raise objections (反对) at the meeting. ---Well, now I regret _______ that.
______Yang Liwei succeeded in circling the earth ______ all Chinese people.
---Where shall we go for the holiday,to the park or to the cinema? --- _____I don’t really mind.
The naughty boys hid themselves in the place_____ their parents couldn’t find them.