The limits of a person’s intelligence, generally speaking ,are fixed at birth, but he reaches these limits will depend on his environment.
Don’t take a chance! Our teachers won’t have you ____ cheating in the exams.
I am not feeling myself today! We ____ have drunk that much beer last night.
--- What ____ have happened to Kevin? --- He might have run into some trouble.
If you want to catch your flight, you’d better ____ for the airport right now.
This song ____ me of my sweet childhood.