7．You will find the dictionary very _____ (有价值的) in your translating.

6．The study raises the _____ (可能性) that dieting is bad for your health.

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.