按各小题的要求转换句型，保持句子原意，每个空格只准填一个单词。

1. This is an American boy. He went to Tibet with my cousin last month. (合并成一个句子)

    This is the American boy ________ ________ my cousin went to Tibet last month.

2. This question is difficult for me to answer in such a short time. (同义句转换)

    I ________ _________ difficult to answer this question in such a short time.

3. My grandaunt has not eaten any meat for over fifty years. (同义句转换)

    My grandaunt has ________ a _________ for over fifty years.

4. My new teacher told me not to feel so tense in class. (同义句转换)

    My new teacher told me to feel ________ ________ in class.

5. Mike Tang is living in America. His ancestors came from China. (同义句转换)

    Mike Tang is an - ________ ________ in America.

执行力在群体中的作用包括（）.

A、执行力是群体合作的基础

B、执行力是群体持续发展的助力器

C、执行力是群体能够打胜仗的保障

D、组织执行力是凝聚组织力量的源泉