1．When electricity was discovered in the late 1800s，
people__________(live) in remote areas began to use windmills(风车) to produce electricity.
2．As is known to all，travelling is__________(interest)，but we often feel__________(tire) when we are back from travels.
3．Any medicine__________(take) without following the advice of a doctor can cause trouble.
4．Don't leave the water__________(run) while you brush your teeth.
5．The teacher's explanation of the problem was
so__________(confuse) that most of us couldn't understand.
6．Many patients became more and more impatient in
the__________(wait) room.
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