1、The bag()()()(由……制成)plastics.1、They are ()()()(努力保护)the environment.3、Some of the swamps have()()(变得污染了)

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1、The bag()()()(由……制成)plastics.1、They are ()()()(努力保护)the environment.3、Some of the swamps have()()(变得污染了)

1、The bag()()()(由……制成)plastics.1、They are ()()()(努力保护)the environment.3、Some of the swamps have()()(变得污染了)
1、The bag()()()(由……制成)plastics.
1、They are ()()()(努力保护)the environment.
3、Some of the swamps have()()(变得污染了)

1、The bag()()()(由……制成)plastics.1、They are ()()()(努力保护)the environment.3、Some of the swamps have()()(变得污染了)
1.is made of (看得见原材料 而be made from 看不见原材料)
2.try to protect (try to do 尽力 努力 设法做某事 try doing 尝试做某事)
3.been polluted(现在完成时...)

is made of
try to protect
been polluted

is made of
trying to protect 注意时态
been polluted 被动语态