Fill in the blanks in a grid

Hi, I'd like to prepare some exercises with "fill in the blanks" for my italian classes but can't manege it to have a table with single "check" buttons allined like the example I found on the net (https://italiano-bello.com/de/grammatik/trainer-verbi-italiano-condizion...):

How can i get that kind of disposition? I just can have them one after the other, but not from left to right like the four columns in the example.

Do you have any suggestions?

Thank you very much for any hint!

ninus