Topic 2 All these problems are very serious.
Section D
Ⅰ. Learning aims.
Grammar：Indefinite Pronoun and Adverb __________ of us likes pollution.
Don’t spit __________ in public.
__________ should care for wild animals and pla nt more trees.
We should do __________ we can to protect the environment.
Function：
__________ a result, a lot of rich land has changed __________ desert.
Trees can stop the wind from blowing the earth __________.
We shouldn’t leave rubbish __________.
All these problems are very serious, __________ we must do something now.
