Kate was not sure_______.

na, the number of cities is increasing ________development is recognized across the world.

下列各句中，划线的成语使用恰当的一句是 （ ）

You _____come to his office. Ourboss won’t be back until next week.[ ]

suppose you need more people to do the work.—Don’t you know “Three helping one another _________ the load of six”?