2 . It’s a good thing that people are going out to enjoy themselves and to discover the great heritage and history, but it is also quite dangerous if they don’t understand ________ fragile the environment is. (用适当的词填空)

3 . She says that both Greece and China have rich cultures and traditions dating back to ancient times, and ________ there is so much to learn from each other. (用适当的词填空)

4 . Libraries have evolved as the public’s needs have changed. In fact, if you haven’t visited your local public library for a while, you may be surprised at ________ it now has to offer. (用适当的词填空)

5 . Ever wonder ________ it would feel like to hide away in a dark cave without being connected to the outside world for 40 days? Fifteen people in France just did that. (用适当的词填空)

8 . On the first day of the Start of Autumn, usually people will weigh themselves and compare their weight to ______ it was at the Start of Summer. (用适当的词填空)

10 . “It proves to me ________ the cause I’ve engaged in is world-class and for all humanity,” Chen said. (用适当的词填空)