re very impolite to him, for ______you should make an apology to him, I think,

Recently, many people dare not eat becauseof H7N9 (禽流感).

The main drawbacks of the Internet I will address today are that it has much information____ has not been evaluated for accuracy, and that it is transforming the way ______ people spend their time.

great progress it has made since Hong Kong returned to China in 1997.

The large grassland, reaching out far away, looks extremely beautiful _______ the blue and clean sky