5.His _____(发现) included 300 uses for peanuts and 200 uses for sweet potatoes.
4.Terry cannot ____(参加) in the match because he has hurt his foot.
3.The boys stood there, ______(讨价) with the seller over the price.
2.The demand for phone numbers has increased since the _____ (到来) of mobile phone.
1.It is said that all of the ____ (音乐的) instruments are made in china.
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