问题补充：
1. My grandfather left his hometown over 55 years ago.
My grandfather1. has been away from his hometown; more than for 2. since my grandparents got married 3. been in Nanjing 55 years.
2. My grandparents got married 50 years ago.
It’s 50 years4. didn’t; until 5. spent; traveling
3. My grandfather arrived in Nanjing last Monday. He is still in Nanjing.
My grandfather has since last Monday.
4. My grandfather went to bed very late last night. He was too excited.
My grandfather go to bed it was very late last night. He was too excited.
5. It took my grandfather two days to travel around the center of the city.
My grandfather two days the center of the city.
答案：
解析：
1.本题的含义也可以用完成时态的结构，意思为我的祖父已经离开家超过55年，more than也可以表示超过的含义，和时间长度连用不能用短暂动词，可用be away来表示，故本题空格处填has been away from his hometown; more than。
2.本题的含义也可以为自从我的祖父母结婚以来有50年，使用since从句，后跟一般过去时，故本题空格处填since my grandparents got married。
3.本题的含义也可以表达为我的祖父自从上个星期一以来就一直在南京，主句应该使用完成时态的结构，故本题空格处填been in Nanjing。
4.本题的含义也可以表示为我的祖父昨天完成直到很晚才去睡觉，not……until可以表示直到……才的含义，故本题空格处填didn’t，until。
5.本题的含义为我的祖父花费了两天的时间在城市的购物中心旅行，表示某人花费用spend，过去式为spent，在做某事上用doing，故本题空格处填spent，traveling。
