Dialog 1 the sky's the limit [ 限りがない、無限の ]

Angela:I've been in Japan for five years and I still can't speak Japanese. Any tips?
Yukio:Immerse yourself in it. Read it, write it, speak it, listen to it, live it and breathe it as much as you can, every day.
Angela:Maybe I can get a better job if I improve.
Yukio:As for job opportunities, the sky's the limit! You can do almost anything you want if you can master both languages.

Dialog 2 leave someone in the dark [ 伏せておく、隠しておく ]

Yukio:Why is your rent so cheap? I'm envious.
Angela:The people who lived here before saw ghosts and heard strange noises.
Yukio:You mean it's haunted?! Why would you move into a place like this?
Angela:The real estate agent left me in the dark about it! Can you believe that?!