We finally bought a house, _________ about seven feet by ten.
—Mum, I'm tired. —Well, if you ________ go to bed after midnight every night, what do you expect?
The children ________ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
—Why are your eyes so red? You ________ have slept well last night. —Yeah, I stayed up late writing a report.
Some young people these days just ________ go out of their homes to contact the real world.
Why ________ it get colder when we climb up a mountain? We are getting nearer to the sun!