if a card has multiple cloze deletions, instead of having separate cards for that --make it so that you test on the card and not the cloze deletion. For example:

if you have

{{c1::x}} + {{c2::y}} = z

if you guess x wrong, then instead of testing on c1 again --when you see it again, it tests you on y. So you're not testing the cloze deletion, but rather testing the card or core concept. This lightens the amount of workload a person would have without sacrificing too much.