1. 覗き込む
Have you ever looked into the wrong end of a telescope?(望遠鏡を反対側から覗き込んだことがありますか？)
2. 調べる
Police looked into the man's background and found he had a history of mental illness and a criminal record for weapons charges.(警察は、男の経歴を調べて彼に精神障害と銃器保持の前歴があることをつかんだ。)