某校举行地震逃生演练活动,小明同学对此不以为然:又没发生地震,用得着那样练吗?他的这种想法是
We have to ______ everything question in detail ______ we take action.
It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
From my point of view, the theory that ______ by the scientist is not quite scientific.
The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world.
I came here with your mother ________ to see you.