Never _______ protecting our earth. It is the only nice planet for us to live on.

It was not until the 1960s and 1970s archaeologists made real progress in understanding the script.

g is a small city. Therefore, to ______ the flowof traffic, the government has decided to broaden some main streets.

There are many other examples _______ thedevelopment of Chinese writing.

This is no-smoking zone. Can’t you see the sign on the wall—–Oh, sorry. I ________ it.