_____ I catch a cold, I have pain in my back.
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.
Having decided to take the trip, he ______ preparing for it.