Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
You had better book rooms at the hotel in advance ________ you should find no room on your arrival.
________ you are unable to deal with it, perhaps we should ask someone else for help.
You seem to have a readymade answer ________ I ask you a question.
—What has made John look like lacking sleep? —________ he had to prepare for the coming exam and stayed up last night.
Everyone is different and that is ________ makes our world much better.