—I don’t suppose they could have finished their experiment,      they?—       , they are still doing it in the lab.

He ______ the key, so we ______ into the office.

Maybe if I________ science, and not literature then, I would be able to give you more help.

Don't handle the vase as if it ______ made of steel.

Mr．White         to hospital for an examination yesterday but he was too busy to come．