hard to believe that Jack ________ have foughtwith the policeman— Yes If one ________ ask for trouble, it can’t behelped

I love teachers ________ are friendly to us.

下列各句中，没有语病的一句是 (　　)

The water of the Miyun Reservoir is regularly ______ to ensure the security of Beijing people’s drinking water.

The lazy boy ______in bed, ______he was ill.[ ]