John, look at the time. ______ you play the piano at such a late hour ?
--- Have you finished the report? --- No. I ______ it all this week.
--- What ______ when I phoned you? --- I ______ my work, and I wanted to go out.
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
You will see this product made in this factory _____ wherever you go.
_____ the big snake, the little girl stood under the tree _____ to death.