Choose the missing terms out of the given alternatives : ajs , gpy , ? , sbk , yhq

The correct answer is $\boxed{\text{dmv}}$.

The sequence is a simple alternating substitution cipher, where each letter is replaced with the letter three places after it in the alphabet. So, $a$ becomes $d$, $b$ becomes $e$, and so on.

The first two terms are $ajs$ and $gpy$. Following the pattern, the next term should be $dmv$.

The other options are incorrect because they do not follow the pattern.