.The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
The plan _________ just because people were unwilling to cooperate (合作).
Jack, I’m afraid I’ll turn to you.I think chemistry is _______ physics.
Not until then did I find it _____ to do the job that way.
Most of the professors _____ to our school were from South Africa.
You may takehalf of the cake; they’re exactly the same.