There are about 6,000 languages that are spoken around the world, but 43% of them are dying out. If no is taken, some of these languages will disappear. (act)
Who is (敲)at the door?
Maybe it's the postman.
I can't hear you (清楚地). Please speak a little bit louder.
I met a friend of (她的)in the street yesterday.
Drinking too much juice can be (有害的) to people's teeth.
The use of new energy cars helps to reduce air (污染).
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