半条命2三合一修改器:It's the third time__late this week答案为什么用when you have been而不用that you are

It's the third time__late this week答案为什么用when you have been而不用that you are I can't see the ball. It's ( ) the door. There is ? in the tree. what's it? Can't you see it's a cat? It's raining.Don't play ____ the classroom. Is there dispute arising from infringement upon the third party's industrical property. the seller is responsible for any infringement of any third party's intellectual property rights it is the third time _______late this week. Don't forget,it's that's schooling the horse,not the orther way round.的译文是什么? _____is the pen? It's green. It's ( ) ,in the drawer?