A man may usually be known by the books he reads _____ by the friends he keeps.
While he was ______ about in the street, Mary came up to him.
---- I must be off now. See you! ---- ________. See you!
In order to change attitudes ________ employing women, the government is bringing in new laws.
---- Do you have the time? ---- Sorry, I have no watch. ---- ________
He was unable to ________ to the students what he meant.