I remember _________the factory owed a small workshop and two machines.

October 15th,2008 is the first Global Handwashing Day, ____goal is to create a     culture of handwashing with soap.

When        different cultures, we often pay attention only to the differences without noticing the similarities.

With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.

When we start gazing into the night sky with a telescope, soon we’ll be astonished by the realization _______ we and our world are part of this giant system.