How do you say, "I will go home."?

When you saw an interesting movie, you say...

What is the antonym of つめたい？

ひこうきにのります。どこにいきますか。

How do you say, "I speak in Japanese."?

What question do you ask in order to get the answer "よじにきました”？

What is the other way of saying "これはやすいじてんしゃじゃないです"?

How do you say "I didn't go to the library with my friend today."? (make sure to say 'time' first, and without "I")

How do you say, "I bought a new bag at the department store."?