(2013·江苏，28)In the global economy，a new drug for cancer，________it is discovered，will create many economic possibilities around the world.

This is my good friend. _________ name is Linda.

Sonia puts _____ clock and _____ art book on her desk.

______，I will help you with your work.

The _____ traffic stopped me from going toschool on time yesterday. I waslate!