---Do you think there are______ new words in this unit ?---Yes, that’s right. I’ll ______first.
— TV was invented in _________ century. — Is that true?
—When _________ personal computers _____________? —In 1976.
—Must I finish my work today? —No, you ____________. You _____________ finish it tomorrow.
I think the Great Wall is _________ unusual wonder in the world.
--- Thanks for offering us so many useful materials. --- _________________________。.