①保护环境、保护鸟类，就是保护人类自己②麻雀虽然普通，却也是生物链条上不可或缺的一环③该地区求购活麻雀纯粹是作秀，没有任何价值④引进野生麻雀，目的是保护绿地，维护生态平衡

用方框内所给的单词，根据句意用其适当形式填空

⑴Tomorrow will be my father’s ____  birthday.

⑵Don't go out. It ____  outside now.
⑶This sofa is very ____  to sit on.
⑷Today is hot. Why not ____  swimming!
----That's a good idea.
⑸Millie and Simon live in the same____  .
⑹Helen often ____  the early bus. So he is often late for school
⑺My answers are different from ____ 
⑻Outside the garden there ____ a bus stop and many tall buildings.
⑼At ____  thirty students go to school by bus in my class.
⑽You can ____ a lot of souvenirs here.