The man showed us such a heavy stone ________ no one could lift it.

A．that  B．as  C．which  D．and

The number of the audience，________ we had expected，was well over one thousand.

A．whom  B．who  C．which  D．as

A lot of language learning，________ has been discovered，is happening in the first year of life，so parents should talk much to their children during that period.(2012·安徽，29)

A．as  B．it  C．which  D．this

The air quality in the city，________ is shown in the report，has improved over the past two months.(2012·福建，23)

A．that  B．it  C．as  D．what

(2013·北京，26)—What do you think of teaching，Bob?

—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.

A．where  B．which  C．when  D．that

(2013·福建，24)It's helpful to put children in a situation ________ they can see themselves differently.

A．that  B．when  C．which  D．where

Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)

A．when  B．which  C．where  D．while

Sales director is a position ________ communication ability is just as important as sales skills.(2012·重庆)

A．which  B．that  C．when  D．where

(2010·山东)That's the new machine ________ parts are too small to be seen.

A．that  B．which  C．whose  D．what

(2011·新课标全国)The prize will go to the writer ________ story shows the most imagination.

A．that  B．which  C．whose  D．what