两条直线相交,如果其中一个角是直角,那么其它三个角都是____角,这两条直线____.
The job of the speaker
A____
The first thing that you have to do
Write a ____about yourself
The third thing to do
Read the paper to the____
Things you can't do
Don't ____that will make everyone laugh.
The time to get everything ready
____
不属于一对相对性状的是