Mr. Lee suggested that all of us go out to have a walk to refresh our mind ________ classes.
It’s only ten minutes ______ the meeting but he’s still not here yet.
By the time he was twelve he ______ a chemistry lab of his own.
David jumped _____ to get the first ______ the beginning of the sports.
Who is the singer ______ you like best?
Whose turn ___ the cleaning?