---Have you finished the report?--Sorry. It was so noisy in the office that I couldn’t________ down to write anything.

At first he refused to admit he had stolen but when he was shown the videotape, he _______ and admitted everything.

The plan once I objected to________ out fine.

Our college is going to choose some ______ from the graduates to serve the poor village during the summer vacation．

It is a good plan in theory, but it remains _______ whether it works in practice.