In which sentence are all the words spelled correctly? every shipment of jewlry from a foriegn country must be inspected. the zoology professor impressed us all with his knowledge. it was quite humerous when the potatos exploded in the microwave oven. it was such a good day that we marked the ocassion on the calender.

The sentence in which all the words are spelled correctly is the second sentence - The zoology professor impressed us all with his knowledge.
In the first sentence, jewlry is spelled wrong (it should be jewelry), foriegn is spelled wrong (it should be foreign). In the third sentence, humerous is spelled wrong (it should be humorous). In the last sentence, ocassion is spelled wrong (it should be occasion), and calender is spelled wrong (it should be calendar).