Not able to tap "mark as blank"

Question

while creating fill in the blank quiz i am not able to tap mark as blank. how will i do?

Answer 1

It's easy just write a statement
For example - I love programming.Then if you want to make programming as blank press on the word programming, then it would show you a list in which just click mark as blank.
Click on preview button and check whether there is actually a blank.
while making multi line fill in the blank leave some space between the words and the word which you want to mark as blank.

Answer 2

i had done same but it didn't work.