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をのぞいて

… into

→ を
phrase Rare #34,635
… into を marks the thing being looked into or through. The verb のぞく means to peek or look into something.
JA: 彼は窓から部屋をのぞいてみた。
EN: He tried peeking into the room through the window.

部屋をのぞいてみたら、だれもいなかった。

When I peeked into the room, there was no one there.

その箱をのぞいてはいけない。

You must not look inside that box.

彼は顕微鏡をのぞいていた。

He was looking through a microscope.