英语短文改错 the white pollution probiem was caused by used plasti

the white pollution probiem was【去掉was 或在was 前加which】 caused by used【using】 plastic is becoming increasingly serious ,on【in】 which plastic shopping bags play an important role .in china about three billions【billion】 plastic shopping bags are used every day ,that resuits in a great waste of resources and heavy environmenttal pollution .lucky【Luckily】,the goverment put a nationwide ban on the use of free plastic bags ,demanding that no stores【store】 and supermarket shoud 【加not】provide customers with free plastic bags after june 1,2007.the rule will undoubtedly reduce use of plastic bags or【and】 promote the awareness of environmental protection .he【It】 is strongly suggested that everyone turns【turn】 to cloth bags and shopping baskets

1. was caused ,caused, 2.on which ,in which 3.three billions ,three billion 4.that results ,which results.5.environmenttal...

答案按照行排列
was去掉，
on改为in,
billions改为billion,that改为which,
lucky改为luckily，
stores改为store,
reduce后加the,or改为and，
he改为it,turns改为turn。