Do you purchase online?

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These days I became interested in online shiopping.It does save me a lot of time.But there are some problems,too.Some said it was not that safe to purchse online.So many traps for you to jump in.For sucure,I only buy books at online-shop,for books won't have many problems concerned with quanlity.But some other merchandises,such as digital products, makeups,etc. Do you came across such a problem ever before?