What a pity! Leo missed the football match— ______ He was busy with his schoolwork

下列各句中，没有语病的一句是（ ）

There’s ____ water on the playground, so we won’t have the PE class there

busiest woman in the village, she made ______ her duty to look after all the other people’s affairs in that village.

It’s said that corn was grown a lot in Tibet _______.