The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
________ is of no concern to us.
John hit_________.
The speaker _______ at the audience and then began to make his speech.
I’m sure David will find the library—he has a pretty good ______ of direction.
Then the crowd dismisses(散开)______, and I don’t know what’s up.