Choose two sentences that contain errors in grammar usage.

A: Of the many advantages of country life over city life, my favorite is the opportunity to observe farm animals—especially pigs.

B: Rolling in the mud, I like to watch them play.

C: Myths about pigs abound, including the belief that they aren't very smart.

D: My own observations confirm what scientific research has shown, namely, that pigs are highly intelligent and have very good memories.

E: They can remember where food is hidden, recognize as many as 30 other pigs, and learned their names within a week of birth.

F: Another myth is that pigs are dirty and love to wallow in mud.

G: They actually prefer water to mud.

H: When people joke about “pigging-out,” they can’t be talking about the animal because pigs eat slowly and savor their food.

I: City folks could learn a lot by spending some time in the country.