If you played the Hungry Hungry Hippos board game you'd know that the hippos were trying to eat these objects
Marbles
Much of the eastern border of Roman Gaul was formed by this river that drains into the North Sea in the Netherlands
The Rhine
Clothing worn in a play
Costume
Go to a B&B, bed & breakfast, for a little R&R, which stands for this
Rest & Recreation
Polska
Poland
Hippopotami eat grass, leaves & fruit, meaning they're this, from the Latin for "plant eater"
Herbivores
During Roman rule, the homes of Gallic aristocracy took the form of this type of Roman country manor
A Villa
It's another name for a beautician
a cosmetologist
Abbreviated FT in Basketball, it's done about 15 ft., feet, from the basket
Free Throw
Nippon
Japan
In this 1940 Disney flick, prima donna Hyacinth Hippo cavorts with Ben Ali Gator to the "Dance Of The Hours"
Fantasia
As all schoolkids once knew, a returning Julius Caesar wrote, "All Gaul is divided into" this many parts
Three (3)
It's what a Russian calls a space traveler
A cosmonaut
It's an IFO, as opposed to a UFO
an Identified Flying Object
Magyarorszag
Hungary
Is it any wonder that this Flemish artist, whose early 17th century work is seen here, painted hippopotami? 
Rubens
After defeating the Romans, these people conquered & ruled most of Gaul & at least by the area's present name, they're still there
The Franks
This actor directed a 1990 movie that won 7 Oscars
Kevin Costner
That is right, it's the abbreviation from the Latin for "that is"
i.e.
DAILY DOUBLE
Hellas
Greece
Back in the day, if you were the Bishop of Hippo, you were based in what's now this North African country
Algeria
Cisalpine Gaul, meaning "Gaul on this side of the Alps", included the northern regions of this modern-day country
Italy
San Jose is its capital city
Costa Rica
Type of product on which you'll find an ISBN
a Book
Suomi
Finland