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He seems too tired today, and I wonder__________ he got a good sleep last night.

It's not necessary to explain the truth _____ there is spring wind, there is green grass．

_____ New York _______ London are two of the largest cities in the world.

______ leaves the room last ought to make sure that the windows are closed and the door locked.

News came from the school office ________Wang Lin had been admitted to Beijing University.

The organizers promise   ________wins the first prize a chance to go abroad。

The research also raises the question ________ children from low-income, less educated families need earlier aid.

Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too.

Paul was not allowed to work        he was fully recovered from the flu.