Vhich is a complete sentence? A leap year typically occurs every four years.
Let's spruce up this room new drapes would be an
improvement.

the first one

Explanation:

A leap year typically occurs every four years.

Let's spruce up this room new drapes would be an improvement isn't complete since there should be a period between room and new.

YOU KNOW THE RULES AND SO DO I

Explanation:

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!