假设你在参加“保护地球”英文征文活动，请以“Save the Earth！”为题写一篇短文投稿。内容要点包括：

注意:1. 词数80左右。短文须包括所有内容要点，要点表达不分先后，可适当发挥，使短文连贯、通顺；开头已为你写好，不计入总词数；

2. 短文中不要出现具体的学校姓名和人名；

Save the earth

Our earth was healthy and beautiful in the past. However,

These books were really good, so she couldn’t .

A. put down it B. put it down

C. put down them D. put them down

—Do you think if Tom the work well?

—I think he will if he his best.

A. does, will try B. will do, tries

C. does, tries D. will do, will try

—I have never been to African countries. What about you?

— ________.

A. Neither have I B. So do I

C. Neither do I D. So have I

Don’t worry! I’ll do what I can you when you are in trouble.

A. to help B. help

C. helping D. helped

—I'm going to visit Yellow Mountain with my family this weekend.

— ________.

A. Good luck B. Congratulations

C. Have a great time D. That sounds good

— ________ have you learned to play the piano?

— ________ five years ago.

A. How long, For B. How often, For

C. How long, Since D. How soon, Since

—Are you worried about the coming exam?

—No, I think the more ________ you study, ________ mistakes you’ll make.

A. careful, the less B. careful, the fewer

C. carefully, the less D. carefully, the fewer

—Do you know __ ___?

— Sorry, I don’t. But I saw her just now.

A. where has she gone B. where she has gone

C. where she has been D. where will she go

I have __ ___ decided when to leave, but my sister hasn’t decided__ ___.

A. yet, yet B. already, already

C. already, yet D. yet, already