--- Do you think it’s a good idea to make friends with your students?--- _____, I do. I think it’s a great idea.
What wonderful world it would be if all countries in the world could live peace with one another.
Ournew 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.