—Why are you looking so worried?
—I sent an email to my son in America last week, but no reply ________.
| A．was received | B．had received | C．has received | D．has been received |
I, not you , _____ in the wrong. Not I but he _____been invited .
| A．were ; have | B．were ; has |
| C．was; has | D．was ; have |
The population of China is larger than ______ of any other country in the world.
| A．that | B．it | C．one | D．this |
Modern science has given clear evidence ______ smoking can lead to many diseases.
| A．what | B．which | C．that | D．where |
This is the first time that we ________a film in the cinema together as a family .
| A．see | B．had seen | C．saw | D．have seen |
He was told that it would be at least three more months ___________he could receover and return to work.
| A．when | B．before | C．since | D．that |