と

パン ___ 卵を 買いました。

The particles "と" (to) and "や" (ya) both mean "and." "と" is used to list all items exhaustively, meaning only bread and eggs were bought. "や" is used to list a few examples among others, implying that other things might have been bought too.

助詞(じょし)「と」と「や」は、物事(ものごと)を並列(へいれつ)に繋(つな)げる「と」と「や」です。「と」は全(すべ)てを、「や」はいくつか例(れい)を挙(あ)げるときに使(つか)います。例(れい)：「本(ほん)とペン。」