I wonder how it ____ that Chinese climbers successfully finished the torch relay on the Mount Qomolangma, where the air is so thin.
There are plenty of jobs ___ in the western part of the country.
The girl was so ___ that she let out a ___ cry.
The village I grew up ____ has changed a lot.
We went to Canada to travel and my cousin ___ as our guide.
Gun control is a subject ___ Americans have argued for a long time.