用所给单词的适当形式填空

　　Li Shizhen  1  　 (be) born in 1518．His father was a poor doctor．

　　Li Shizhen often  2  　 (see) that people fell ill．He  3  　 (decide) to study medicine so that he could 4  　 (be) able to help people．

　　Li Shizhen  5  (read) many books about medicine．He  6  　 (find) many of the old medical books to be full of mistakes．So his wish was to write a new one．

　　He  7 　 (do) his best to study medical science．He 8  　 (study) not only the herbs(草药)in his own garden，but also the wild ones．He  9  　 (set) out many times on long journeys to collect herbs and 10  　 (talk) with old peasants． He  11  　 (1earn) a lot from the working people．

　　After many years of hard work and study，Li Shizhen  12  　 (finish) his great work Compendium of Materia Medica(《本草纲目》)．At that time he was sixty． His book  13  　 (is) now one of the greatest contributions(贡献) of the Chinese people to the medical science of the world．

　　　　  you 　　　　  　　　　  　　　　  Li Lei’s home?

2. 我从前见过，但它们一点也不漂亮。?

I’ve seen them 　　　　 ,but they weren’t beautiful 　　　　  　　　　 .

3. 他们来这里刚十年。?

They 　　　　  　　　　  here 　　　　  just ten years.

4. 保护环境非常重要。?

 　　     　　　　  　　　　  our environment is very important.

5. 那是一种有助于保持我们城市清洁的愉快的方法。?

It’s a 　　　　  　　　　  to help keep our city clean.

6. 我们要努力把大地覆盖上绿树。?

We are trying to 　　　　  the ground 　　　　  green trees.

7. 突然一曲优美的音乐传入我的耳朵。?

　　 　　 a piece of beautiful music 　　　　  　　　　  my ears.

8. 你曾经乱砍伐树木吗？?

Have you ever 　　　　  　　　　  trees?

9. 如果人人都为环境保护做一点贡献，世界会变得更美好。?

If everyone 　　　　  　　　　  　　　　  　　　　  protecting the environment, the world will become much more beautiful.

10. 我一到北京，就给你打电话。?

I’ll call you 　　　　  　　　　  　　　　  I get to Beijing.