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To improve the quality of our products, we asked for advice had used the products.

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improve  to improve  improved  improving  
our natural surroundings are in danger of being destroyed by industry  the fixed supply of natural resources marks a point beyond which economic growth cannot continue  the world population is ever increasing  more efforts should be made to improve the quality of our material life  
who    whoever    which    whichever  
whoever    who    whichever   which  
who    whoever    that    which  
whoever    who    whichever    which  
anyone    who    no matter who    whoever  
whacver   who   whichever   which  
whoever  who   whichever  which  
better use of greenspace facilities should be made so as to improve the quality of our life  attention must be directed to the improvement of recreative possibilities  the urban environment is providing more recreation activities than it did many years ago  priority must be given to the development of obligatory activities  
we should regard such entertainment as an important part of our cultural heritage.  we should improve the entertainment in form and quality today.  we should never underestimate the skills used by people in the 19th century.  we need to make more people aware of this unique form of entertainment.  
more efforts should be made to improve the quality of our material life  the fixed supply of natural resources marks a point beyond which economic growth cannot continue  the world population is ever increasing  our natural surroundings are in danger of being destroyed by industry  
supplied  supplied with   supplied for  supplied to  
whoever  who  whichever  which  
whoever  who  whichever  which  
whoever    who    whichever    which  
the seas we will depend on for future food have been more or less contaminated.  the marine resources are directly bound up with our future life.  the exploitation drives are essential for us to improve the quality of llfe on the earth.  the ecological balance in the seas has nothing to do with that on the land.  
whatever    who    whichever    which  

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