Do you know ______ Zunyi or not tomorrow

Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？

J. K Rowling’s career really ________ when Harry Potter and the Philosopher’s Stone was published in June 1997 and achieved instant success.

There will be less pollution _____ more people use public transportation.

The number of children who___________ both parents to Aids ________ also expected to rise, reaching more than 26 million in 2010.