你到达时请在接待处办理入住手续。

Please ___check ___in at the reception desk when you arrive.

我们在酒店办理入住后，早早睡觉了。

After we ___checked ___in at the hotel, we went to bed early.

你应该下午3点前到酒店办理入住以获取钥匙。

You should ___check ___into the hotel before 3 PM to get your key.