Is the Fill in the blank the most suitable way?

Hi everyone!

I'd like the learners to name 3 diseases among 20 possibilities.

I thought that I could use 3 blanks in wich the learner could type his 3 answers.
But it means that one blank must accept several words.

I tried several solutions (this one for example) but it doesn't work exactly as I'd like...

Then : 1/ do you understand my problem (so bad english...)?
and 2/... would you have any solution? ;-)

Thanks!

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