Mary had taken _____ to see that her guestshad everything that they could possibly want

_____ the temperature is, _____ water turns into steam. [ ]

It was after he got what he had desired _____ he realized it was not so important.

Could you tell me what time the train leaves Hefei for Beijing–I’m afraid you need to ____on the Internet．

We must be______that this year might be the worst in recent times for our economic development.