Spelling list: -o words - a mixture

On the end of these words the long /o/ sound is spelled with just the letter o.

cargo	They loaded the cargo onto the ship.
domino	Have you heard of the domino effect?
echo	My voice created an echo in the cave. *
halo	The angel's halo shone bright.
hero	The tomb of the dead hero has many visitors.
judo	My sister is a judo champion.
logo	We hired a designer to create our logo.
memo	Send me a memo about the meeting.
photo	Would you like to see a photo of our baby?
veto	The president used his veto to override the committee's decision. *
casino	I visited a casino in Las Vegas.
curio	Antique markets are often full of curio stalls.
inferno	The firefighters tackled the inferno.
patio	We had a barbecue on the patio.
studio	We recorded our song at the studio.
tornado	Was the damage caused by a tornado?
torpedo	The submarine shot a torpedo. *
volcano	When will the volcano next erupt?
yo-yo	My son loves playing with his yo-yo.
zero	You can stop when the timer reaches zero.