1、He told us about the countries that/which/不填 he had visited.
2、Egypt is a country which is famous for its pyramids.
3、China is the country where he spent the best part of his life.(对的)
4、The days that/which/不填 we spent together cannot be easily forgotten.
5、The house stands at the place where the two roads meet.
6、We shall visit the college where his father teaches there.(对的)
7、I know the reason why she looks so worried.
8、He left me the book which is very useful for me.
9、This is the room where food is kept.
10、April 15, 1976 is the day that/which/不填 we’ll never forget.
11、The man who came yesterday is our English teacher.
12、I know the student who was praised at the meeting last week