I Can't UNDERSTAND THIS THING WITH THE FIL IN THE BLANKS SOMEONE PLZ EXPLAIN

Answer 1

Some of them you 'drag and drop' the answers from a set of answers along the bottom (on mobile you tap, hold, drag and lift to drop).

It would really help if you identified the question.

Answer 2

you have technical problem, or with a special question? Technically you tap on the blank place, your console appeares, and you type in the missing word. If you asked for a concrete answer, tell what lesson is about.