lay vt.使躺下；产卵；搁放
过去式laid 过去分词laid 现在分词laying
lie vi.躺；说谎；位于
过去式lay 过去分词lain 现在分词lying
所以
5.根据five years ago
选B
第二空C 表放置,搁放
6.B / C
7.A
long before 意思为：很久以前
before long 意思为：不久,马上
8.C / D
China which belongs to the third World is a developing country.
9.He lost his bag which contained his passport ,IDcard and money.