Quiz playing is a wonderful way to increase your knowledge of English as a Second Language. Remember that all of our ESL quizzes have titles that are both friendly and technical at the same time… In the case of this quiz you might like to tell your friends about “Don’t Trip Over This!” but no doubt your teachers will talk about the “Contractions quiz”! If you hear a technical term and you want to find a quiz about the subject then just look through the list of quiz titles until you find what you need.
Spoken and casual written English use a lot of contractions ('Don't they?')... Here is an opportunity for you to practise forming and using contractions fluently.
Don't trip over this... it's not particularly tricky!
If we were avoiding Contractions completely, Answer 1 makes adequate sense as it stands ~ referring, more or less, to a (Present) 'rule of life', i.e. that if 'they' make one change, 'they' should expect consequences to follow.