根据句意，用所给单词的正确形式填空。
We should train _________ (us) before the oral English test.
After listening to the music, he felt very _________ (relax).
It’s a good habit to return the book ________ (borrow) from the library on time.
Just as the old saying goes, “When the cat’s away, the _______(mouse) will play”.
Zhang Ziyi won the Best ______ (act) for “The Grandmaster” at the 8^thAsian Film Awards.