I don’t know ________ a show. Can you tellme

_______ in doing his homework , he didn’t know I had walked in.

I waited for my friend for a long time at the bus station，but she didn’t________at last．

下列句子中，没有语病句意明确的一句是（ ）

It was at the very beginning _______ Mr. Fox made the decision _____ we should send more fire-fighters there.