根据短文内容和所给的中文提示，写出空白处个单词的正确形式，每空限填一词。
A ___________ (旅行) by train is more relaxing than by coach.
The panda is one of the animals in danger, we must__________(保护)them.
Learning ___________(语法) is important for students to learn English well.
These houses here are __________(低的) than the buildings in the city.
Our school volleyball team will play ____ (对决) your school team next Saturday.
The man is very tired. _________(然而), he feels happy.
How many _________(小说) does he write every year?
Our __________(政府) is working hard to help the poor.
He ___________(扔，掷) his old shoes just now.
There is a lot of  _____________(污染) around us .