最佳答案:

　　A． 写出下列单词的名词形式。

　　1． invention

　　2． education

　　3． congratulation

　　4． protection

　　B． 写出下列单词的形容词形式。

　　1． careful

　　2． useful

　　3． helpful

　　4． forgetful

　　C． 写出下列单词的副词形式。

　　1． noisily

　　2． easily

　　3． clearly

　　4． luckily

最佳答案:

　　One possible version :

　　It's our duty to protect the earth． I always turn off the lights when I leave a room． While I am washing my hair, I usually turn off the shower． Besides, I stop using paper napkins and if I want to shop, I always take my own bags instead of using plastic, bags． I have decided to do more things to protect our earth, such as stopping riding in cars and riding a bike, and recycling books and paper． I think my actions can make a difference !

最佳答案:

　　1． sharks

　　2．harmful

　　3．recycling

　　4．wooden

　　5．costs

最佳答案:

　　1． turn; into

　　2．throw; into

　　3．makes a difference

　　4． play a part in

　　5．used to

最佳答案:

　　12345BACBC

最佳答案:

　　1． have been given

　　2．turning

　　3．pollution

　　4．differences

　　5．suddenly