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But he believes the method is not efficient and sometimes a waste of time because the same question may be difficult for one student but easy for another.

But fee shipping is no longer enough. Amazon’s own subsidiaries, Diapers.com and Zappos.com, will get a package to you faster than Prime for free, and other retailers allow you to pay nominal fees to speed up delivery, especially on purchases over .

But he added that opportunities still abound in China, one of world's largest consumer electronics markets. According to Apple, the company's wearable business in the country is up more than 50 percent, and two-thirds of Macs and iPads were bought by first-time local customers from September to December.

But he said there are some common practices at secondary schools to manage students who are absent from classes. Parents have to submit an application if their children are not able to attend school, and the school will review whether the absence is reasonable.

But privacy advocates have concerns.