Crusoe’s dog became ill and died, ______made him very lonely.
—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.
—Jenny took the 8:00 bus to Shanghai this morning.—Really? She ______ the 9:00 train. It's much more comfortable and safer to travel by train.
Hi, sir. Some students want to see you. ______ they wait here or outside?