几道数学题和英语题.求助!

题目

几道数学题和英语题.求助!
数学：（过程）
（1）：
1-2+3-4+…+99-100
英语：
In China, we put _____ name_____.
A .last;last B:first;first
C:first;last D:family;first
She is a new student.(改为否定句）
She_____a new student.
8+9?
_____eight____nine?
这是我的身份证号.
This is _______ ______ ______ _______.
His family name is Green.(改为同义句
____ _____his____num.
She is A new student at school.(改为一般疑问句）
_____ ____a new student st school?
根据句意及首字母提示填空.
A c______ can tell you the time(时间）,
I can a______ your question.
Five and three is e_______.

答案

数学题：
看做：1-2,3-4.99-100
实际上就是50个-1相加,结果为-50
英语：
D
isn't
is add
my ID card number
is her
clock ask eight