1 the best recruiting agents

It's stated in the passage that

1. 
   the standard grip is the most effective way of holding the brush
   
2. 
   teeth should be brushed regularly in order to prevent the gums from receding
   
3. 
   when the bristles of a toothbrush are too soft, they can't clean the teeth effectively
   
4. 
   when done too frequently, brushing may do harm to teeth
   
5. 
   you'll hurt the gums of your teeth if you scrub them strongly
   

2. 
   It's advised, in the passage, that in order to obtain better results one should
   

1. 
   consult an expert for the proper way of tooth-brushing
   
2. 
   take great care of the teeth for complete well-being
   
3. 
   brush the teeth gently, moving the brush in circles
   
4. 
   not exaggerate the frequency of tooth-brushing
   
5. 
   hold the brush in the palm and move it slowly up and down, without pressing the teeth a lot
   

3. 
   According to the results of the research carried out in Finland
   

1. 
   holding the brush like a pen reduces the harm done to the gums
   
2. 
   most people are not aware of the proper way to brush their teeth
   
3. 
   people feel great happiness when their teeth are well-cared for
   
4. 
   people in general are quite careless about their teeth
   
5. 
   if you hold the brush between your thumb and first two fingers, you'll do no harm to your teeth
   

124 THE BEGINNING OF SYNTHETICS
Nearly five thousand years after a Chinese Empress discovered, quite by chance, how to unwind the fine thread of the cocoon of a silkworm, a Frenchman, experimenting with the crushed leaves of the mulberry tree on which the silkworm feeds found out how to produce a fine silk-like fibre which we now call artificial silk. His discovery stimulated other scientists to search for new fibres, and it was not long before several more were produced, but all of them had as their starting-point some natural organic material, such as cellulose, casein, etc. It is only fairly recently that man has succeeded in synthesizing new fibres from inorganic materials. Everyone has heard of nylon, and scarcely one of us can say he doesn't use something made from this product every day. But nylon was the first of an ever-lengthening list of new synthetic fibres. Now hardly a year passes without some new fibre making its appearance and some unfamiliar name finding its way into our everyday speech.

1.