collocations

Everyday routine is perfectly possible.

Thanks very much, Centrox! So I presume it is the correct word to insert out of the words listed in parenthesis, right?

Well, it's definitely not wrong. Some of these multiple choice questions are given strange "correct" answers, particularly if they are devised by non-native speakers.

Just look on the web

Eyebrow filling is a basic in our everyday routine
An Everyday Routine That Can Cause Terrible Damage!
Everyday routine of a model
Habits are most effective, or on the contrary destructive, when they become part of your everyday routine
Fire Up Your Everyday Routine by Looking At Art
Preparation for colonoscopy in everyday routine
Make fitness a part of your everyday routine!

Thanks, Centrox. I totally agree with you about the "correct" answers to multiple choice questions. Yet, the exercise I referred to was created by British linguists who seem to use their own preferences from time to time. I have often run against situations where two or even three answers were actually correct, but only one of them was to be accepted. And since those were written tests, there was nobody to appeal to to prove your case. I even know one American, born and well educated in the United States, who failed to pass an international English language exam for three times in a row. His grammar was absolutely correct, but only one option was to be deemed correct. Life is full of surprises!