1 . The flower grows about two ________ (厘米) every day. (根据汉语提示单词拼写)

2 . The ruler is 30 ________ (厘米) long. (根据汉语提示单词拼写)

3 . A c________ can be infinitely divided into smaller units. （根据首字母单词拼写）

4 . 语境填空

detect；generate；decline；primitive；centimetre；link；blame；characteristic；sample；root

1. The length of this pen is seventeen____________.
2. We are pleased to know about the bonds that____________them.
3. They found a____________tool in the mountain.
4. I have no one to____________but myself for the poor grades of the exam.
5. The experts say that housing prices will____________by the end of the year.
6. Genes determine the____________of every living thing.
7. We have____________a complicated password for you for security reason.
8. Here is a____________of the cellphone for you to try.
9. The police are trying their best to____________the murder.
10. The____________of this tree is well protected from the worms.