You mustn’t go off on your own, because you______get lost in the mountains.

How did you sleep last night?——Like a log Never slept ____

lecture, the professor told his students how to write an ______ of a graduate paper, expressing the main argument.

I could just see a car in the distance, but I couldn’t _____ what color it was.

Many people may be surprised by the number of chemicals that they are exposed to through everyday household products.