Three years ago, Sarah ____ understand spoken English, but now she can. When I was a teenager, I ____ eat a whole pizza by myself, but I can't now. Joshua ____ speak Spanish, but his mother ____. My dad called me over the Internet. I ____ hear him fine, but I ____ see him because his webcam didn't work. Alexander Graham Bell was the first person to talk on a telephone. When he said, "Watson, come here," his assistant Thomas Watson ____ hear him.

COULD, COULDN'T, BE ABLE TO, NOT BE ABLE TO

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