你必须在十点前回家。

You ___have to be back home by ten.

你一定要看看这部电影，它太精彩了。

You ___have to watch this movie, it's amazing!

那一定是她的钱包，因为只有她有那个独特的钥匙扣。

That ___has to be her wallet, since only she has that unique keychain.