Running a company is not ______ a matter of hiring people—they also need to be trained.

—How did you sleep last night?  —Like a log. Never slept ____. 

 Nature reserves are very important for preserving many animals and plants, which would _______ run the risk of becoming extinct.

. Come _____. I’ll introduce my _____friend, Bob, to you.

This argument sounds reasonable, but ___________ it’s incorrect.