It is such a modern machine ______ few of the workers know how to operate.

He __________ be at home now because I sawhim in the office just now.

Would you mind moving the desk? —______. I will do it right now.

The Great Wall is so good a place________ many foreign people come to visit ________ it has become well knownall over the world.

Everyone will go through life’s stages of ups and downs, ________ self­respect plays a key role in the maturity(成熟) of a person.