Sadly the reading room where Karl Marx did a lot of reading had moved from its place into another building.
Though I am improving my study, I still have a long way to go __________ some of my classmates.
The traffic on the main streets has a longer green signal than __________ on the small ones.
Alice received an invitation from her boss,__________ came as a surprise.
Paper is __________ great Chinese contribution to human civilization.
Read this story,__________ you will realize that not everything can be bought with money.