put it in and leave it there, fill it and leave it
お風呂洗って、入れといてね。
Clean the bathtub and fill it up, okay?
花瓶にお水を入れといて。
Put some water in the vase.
タイヤに空気を入れといて。
Put air in the tires.
鍵は郵便受けに入れといてね。
Leave the key in the mailbox, okay?
これはリュックの中に入れといて。
Put this in the backpack.