In English, we have our "ah" and "um." In Japanese, they have their "eeto." This is the sound you make when you can't think of what to say, but want to say something!
何 の 動物 が 好き です か？
nan no doubutsu ga suki desu ka?
What animal do you like?
ええと。。。 ねこ が すき。
eeto... neko ga suki.
Um... I like cats.