阅读理解。

　　Perhaps once you got free plastic bags when you shopped at the supermarket．But now things have changed already．

　　Since June 1, 2008, China has banned(禁止)its shops and supermarkets providing free plastic bags．Shoppers have to pay for bags if they need them．“We hope it will encourage people to use cloth bags and baskets for their vegetables,” said a spokesman from the Chinese government．“Plastic bags have led to a big waste of energy and on the other hand, they pollute(污染)the air, rivers and soil．It takes around 1000 years for the bags to break down．They are also dangerous to wildlife, which eats them without knowing．”

　　A large number of Chinese people have begun to make their own cloth bags．Li Linwei, a student in Shenyang, Liaoning Province, made a bag out of an old dress of her mother’s．“ I have given it to my grandmother as a Mother’s Day present．From now on, she will use it when she goes shopping．” said the girl．

根据短文内容，回答下列问题。

1．Since what time, supermarkets have been stopped from providing free plastic bags?

2．Without free plastic bags, what will people use when they go shopping according to the passage?

3．Do plastic bags pollute the environment?

4．How long will it take the plastic bags to break down?

5．What present did Li Linwei give her grandmother on Mother’s Day?