He is a model for us young people. We all _____ him very much. [ ]

A. look up to

B. look up

C. look at

D. look after

同一房产向两个以上债权人抵押的，以（）清偿。

A、主合同签订顺序

B、抵押合同签订顺序

C、以抵押物登记顺序

D、以债权人提起诉讼时间前后顺序