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.
缺失，近远中向间隙较小，咬合可，欲行隐形义齿修复。