19.3 Provide the Missing Principal Parts

Fill in the missing principal parts. For second conjugation verbs, use the key at the bottom to insert the long a, e, i, o, and u of the infinitive. Click "Check" to see how you did, or click "Hint" to receive the next letter in an answer.
ait---
caedō
cernō
cōgitō
gaudeō sum---
inquit---------
negō
nesciō
ostentus / ostēnsus
putō
respondeō
sciō
spērō
trādō