2 . 选词填空
extinct;extinction
1. Dinosaurs have been ________for millions of years.
2. Habitat loss and climate change will be the biggest reasons for the ________of the species.

3 . 请根据句子的语境，从下面方框选择合适的词完成下列句子

1. From Michael Jordan to Tiger Woods, superstar athletes say being __________ has been the key to their success.
2. Steven Hawking, born in 1942, is a(n) __________________ physicist in the world.
3. Last month we went to Shanxi Province, where we spent a week doing some ___________________.
4. It is certain that as long as __________ people keep on helping others, the society will change into a big warm family.
5. If the development of online business only depends on __________ benefits, it will never be strong even if it becomes big in the short term.
6. Hiring student assistants can ease the problem of being __________ and reduce the economic pressure of the students themselves.
7. I’m really looking forward to the __________ food at the party.
8. Unlike her twin sister who is very quiet and shy, Anna is very talkative and __________.
9. The ____________________ nature of the new-comer made her very popular among the students.
10. Sarah came back from travel with a couple of ____________________ bags.