__________ the convenience of digital payment, many senior citizens started to use smart phones.
A
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Between the two parts of the concert is an interval, __________ the audience can buy ice-cream.
Wehaveenteredintoanage_______dreamshavethebestchanceofcomingtrue.
China's image is improving steadily, with more countries__________ its role in international affairs.
A city is the product of the human hand and mind, __________ man's intelligence and creativity.