With no explanation, label text_A→text_B with either "False" or "True".
text_A: I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it in. The it is more likely to refer to The key than chewing gum because The keyhole hole already had chewing gum in it. They tried to put the key in, but couldn't.
text_B: In "I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it in. ", The it is more likely to refer to The key than chewing gum because The keyhole hole already had chewing gum in it. They tried to put the key in, but couldn't.
True.