We all know clean water is important for good health．But now we also know we should watch （1）

what

what

we keep our water in．Plastic bottles hardened with a dangerous material （2）

called

called

（call） BPA can release a chemical into our water that harms our bodies．Since 2011，many countries （3）

have banned

have banned

（ban） plastic with BPA from use in food containers and baby bottles．But are other non-BPA plastics safe？
    Plastic labeled BPA-free might use other chemicals that have （4）

harmful

harmful

（harm） health effects． （5）

Studies

Studies

（study） have shown that low levels of those chemicals might have the same effects as BPA．So，what should people do？The （6）

best

best

（good） material to drink from is glass， （7）

which

which

has no chemicals that can poison water．
    Another good choice （8）

for/as

for/as

a drink container is stainless steel．Stainless steel bottles are better than aluminum bottles，which are covered with a thin plastic （9）

to protect

to protect

（protect） the metal from acids．There are many good food-grade stainless steel water bottles on the market．
    If you do decide to use a reuseable plastic water bottle，avoid （10）

keeping

keeping

（keep） it in the sun．Sunlight and hot liquid speed up the release of chemicals into your drinking water．