Are there any restaurants in Beijing _____ authentic Mexican food?
| A．serve | B．that serving | C．that serve | D．serves |
He feltto work for human rights and progress.
| A．it his duty | B．his duty | C．that is a duty | D．that is his duty |
--- Do you like here?
---Oh, yes, the air, the weather and the way of life. Everything is so nice.
| A．this | B．there | C．that | D．it |
Is ____ necessary to complete the design before National Day?
| A．this | B．that | C．it | D．he |
I hate _______ when young people speak to the elderly in a rude way.
| A．this | B．that | C．it | D．one |
______was known to them all that William had broken his promise______ he would give each of them a gift.
| A．As, which | B．What, that | C．It , that | D．It , which |