Though ______, many laws of nature exist.
I told Sally how to get here, but perhaps I ______for her.
Don’t try to cheat the taxman(税务人员); you’ll never ______it.
I’m sorry, but I didn’t mean to keep you waiting here for a long time. Can you______ me?
You __________be tired—you’ve only been working for an hour.
Walking around, I found the city was full of people__________ for the festival.