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Teenagers should be kept     from smoking. It is bad for their health.

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kept up  kept down   kept out  kept off  
should keep    might have kept    should have kept    might keep  
must have kept  can have kept  should have kept  needn’t have kept  
in,with  with,with  in ,in  with,in  
to smoke  to smoking  s  
It should be kept in a well-closed container and protected from light.  It should be kept in an airtight container and protected from heat.  It should be preserved in tight container and avoided excessive heat.  It should be preserved in tight, light-resistant containers, and avoided exposure to direct sunlight.  It should be kept in a fixed container and protected from light and moisture.  
It should be kept in a well-closed container and protected from light.  It should be kept in an airtight container and protected from heat.  It should be preserved in tight container and avoided excessive heat.  It should be preserved in tight, light-resistant containers, and avoided exposure to direct sunlight.  It should be kept in a fixed container and protected from light and moisture.  
should keep    might have kept    should have kept    might keep  
keeps  keep  be kept  are kept  
should not be    should be not    not should be    shouldn’t  
should not be    should be not    not should be    shouldn’t  
It should be kept in a well-closed container and protected from light.  It should be kept in an airtight container and protected from heat.  It should be preserved in tight container and avoided excessive heat.  It should be preserved in tight, light-resistant containers, and avoided exposure to direct sunlight.  It should be kept in a fixed container and protected from light and moisture.  
might have kept    should keep   should have kept    have kept  
It should be kept in a well-closed container and protected from light.  It should be kept in an airtight container and protected from heat.  It should be preserved in tight container and avoided excessive heat.  It should be preserved in tight, light-resistant containers, and avoided exposure to direct sunlight.  It should be kept in a fixed container and protected from light and moisture.  
should keep    was kept    would be kept    be kept  
must have kept    can have kept    should have kept    needn’t have kept  
should not be    should be not    not should be    shouldn’t