If wishes were horses, _____ beggars would ride.
The teacher handed our writings back to us, ______ some necessary changes.
You must ______ that the power is off before you leave the lab.
At such gatherings, people ______ are not necessarily your relatives or friends.
—We’d better go downstairs right now for lunch.—______ They serve food 24 hours a day.
Walking is a nice way to relax. ______, it can help reduce body weight if you do it regularly.