用下列所给的单词的正确形式填空:1、He _____(become) happy when he saw his mother.2、I live on the _____(twelve) floor of the building.

问题描述:

用下列所给的单词的正确形式填空:1、He _____(become) happy when he saw his mother.
2、I live on the _____(twelve) floor of the building.