Students are ____for new knowledge to suit themselves to the future jobs in various fields_______ which they are unfamiliar.

The Summer Palace is really beautiful. In fact, I doubt whether China has _________ park.

Chen Yifei(1946－2005)，who died in his ________ fifties，was ________ successful artist.

In big cities, some workers from the countryside have been tired of moving around and wish for a more    ______ life.

He ran the 100 meters in 9.91 seconds, and I have not seen _________ this year.