A Gap Fill is a question that has a blank field(s) where the users must type (select) an answer. There is only one correct answer to this type of question, although you may want to consider several response options.
You can set the Gap Fill Options and allow users either select the answer from the drop-down list, type it in, or type in one of the suggested answers.
Example of creation form for a Gap Fill question:
The created question will have the following look for the users:
OR:
OR:
