Fill the gaps
Turn any sentence or passage into an exercise: pick the words students should recall, and each one becomes an empty field they type into.
When to use it
Fill the gaps works best for words a student should be able to produce, not just recognise: key terms, vocabulary, a step in a definition. Because the rest of the sentence stays in place, the student has to use the meaning around the gap to recall the word, which is harder than picking it from a list.
If you would rather they choose than type, a gap can be a dropdown instead (see below).
Setting it up
In a worksheet, use the + between two items and choose Fill the gaps task. If it is not in the short list, find it under View all.
Click the pencil to open it and write the instruction at the top, for example "Fill the gaps about water changing state."
Type or paste the passage into the text area below it.
Select a word that should become a gap and click Make Gap. The word is marked as a gap and becomes its correct answer; you still see it in the editor, students see an empty field. Repeat for every gap.
Click the tick when you are done.
Click a gap in the text to open Edit Gap. There you can correct the answer, list other spellings or synonyms under Also accept (one per line), switch the Input Type to Dropdown and add the wrong options under Options (Wrong Answers), or remove the gap with Delete Gap. Click Save to keep the change.
What students do
Students see the passage with an empty field, or a dropdown, in place of each gap. They fill in each missing word and click Submit. Capital letters and spaces before or after the word do not matter: "evaporation" counts the same as "Evaporation".
If the presentation has Show correct answers turned on, each gap turns green or red after they submit, so they can see straight away which words they recalled.
Checking the answers
Every gap is checked automatically against its answer and the alternatives you listed, so there is nothing to mark by hand. An answer with some gaps right is partially correct. In the presentation, open Results to see what each student typed into each gap. A wrong spelling that you would still accept is a sign to add it under Also accept for next time.
Tips
Gap the word the lesson is about, not the small words around it: two or three well-chosen gaps teach more than ten.
Keep enough of the sentence around a gap that only one answer makes sense, or add the other reasonable answers under Also accept.
Use dropdown gaps for younger students or when spelling is not what you are testing.