Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
The engineer ______my father works is about 50 years old.
They arrived at a farmhouse, in front of ______sat a small boy.
The pen ______he is writing is mine.
Can you lend me the book ______the other day?
This is one of the best films _______.