Living with host families, ________ there may be other college students, gives her the chance to learn more about the new culture[ ]

（2017·江苏）He hurried home, never once looking back to see if he _______.

____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”[ ]

The reason why this kind of machine is popular with users is that it will work in ______ temperature.

You may find the answer _____ page 25