根据下列句子及所给汉语注释，在相应的横线上写出各单词的正确形式。
It is good manners to _______ (问候) each other with a smile.
Since the exam is _______ (靠近)， all the students are busy with lessons.
You can see _______ (各种各样的) kinds of animas in the preserve.
Do you know the _______ (长度) of the river?
They finally gained _______ (允许进入) to the party.
The soldiers _______ (摆动)their arms at the same pace as they marched.
Only a _______ (少数) of the students were for his opinion.
Who is to _______ (代表) our school to attend the conference?
_______（成年人）should set good examples to children.
In such weather, I prefer to stay in my _______ (宿舍), reading novels.
Don’t be too _______ (好奇的) about others’ personal affairs.
In most cases he had great courage to _______ (克服) difficulties.
_______ (旅游业) in our city is developing very fast.
We should take his health into _______ (考虑).
On no _______ (场合)can we behave like that.