用方框中所给单词或短语的适当形式填空

disappear, make an advance, unusual, up to, be absorbedin, drop to, reflect, do with

 
The new hall can hold __________400 students.
With the help of his teachers, he has __________ in his study.
When I went in, I found he __________ reading a new magazine.
He ran away quickly and __________ in thecrowd.
"Whatdid you __________ the camels?" heasked angrily.
It's very warm in the daytime, but the temperature may __________ below zero at night.
A child's behaviour may __________ the familyenvironment.
It's __________ for the tree to flower so early.