a volleyball that is on the case and is

Is that his ring( ) the lost and found case?A.at B.in C.on a T-Shirt that is on the bed and is A math book and a pencil case ( )on the table.括号中用is还是are? that is the case是什么意思 Is your notebook on the lost and found case? and the whole world is on your case,写成中文 Is that yuor book ( ) the lost and found case? in the that your and lost found case key is Is that you book in the lost and found case? The case in point is that ,a case in point is that ,是不是都可以啊? there （ ） a pencil case and some books on the desk.（）中应该填is 拜求逻辑达人：it is not the case that A and B