1.It was not __________the clock struck twelve that we went
1.It was not __________the clock struck twelve that we went to bed on New Year's Eve.
A.until B.till C.before D.after
2.John saves his money,__________George spends all he gets.
A.and B.while C.so D.or
3.___________he has finished cleaning the room is unknown.
A.If B.Whether C.When D.While