Every year, more than 13 billion plastic bottles are sold in Britain. All of them     1     (use) only once, and only half of them are recycled.

Some think plastic bottles should be banned(明令禁止).     2     think they should be recycled. Others think a returning plan should be brought in to avoid the     3     (pollute) of rivers and seas. That is to say, people will get up to 20 pence back every time they return     4     bottle. A returning plan for bottles is already     5     (success) in Germany, where 98.5% of plastic bottles are returned.

    6     (lucky), there are already signs that things are changing for the better. Last year, Selfridges stopped     7     (sell) single-use water bottles. London Zoo announced that it would also ban them. It sold 155,000 plastic bottles of water last year. Now it will sell only reusable plastic bottles,     8     can be filled by visitors from taps. Families visiting beaches this summer are being asked to take part in a plan called “Return To Offender”. The idea is     9     (post) plastic bottles and other litter they find back to the     10     (company) that made them, using their freepost addresses.