How far can you run without stopping—_________. I’ve never tried.

I’d appreciate _______ if you could let me know in advance whether you will come or not.

Chang’e-3 landed on the moon on Dec 14, China became the third country _________ this after the US and the former Soviet Union.

His parents ____ high school teachers.

If you don’t study hard, you’ll regret, _____ you?