The little town has now grown into a modern big city, and is ___ what it used to be.
—Can Professor Li be in the laboratory? —He ______ be; I saw him there half an hour ago.
My newly-purchased magazine is nowhere to be found. ______ I have left it on the train?
—Did your mother sleep well last night? —She ______ have slept through all those noises.
Don't use water to put out the fire if oil catches fire. As is known, oil ______ float on water.
—Lisa is going traveling at the cost of losing her job. —Really? She ______ a lot of money.