. ______we’ll be able to drive a car______ by electricity, solar energy in about ten years.
Our new machines are much cheaper to run.
______ today, he would get there by Friday.
—Do you mind if I use your reference book?—No, ______.
I really don’t know______ Mary found her lost necklace that day.
The program “Master’s Lectures” of CCTV is both interesting and instructive. No wonder it_______ a large audience.