He  __  came__  to  Shenzhen  2 years  ago.  
They  ＿lefe＿   China  8  years  ago.
She  ＿＿borrowed＿＿  this  book  2  weeks ago
改完成时吧
he has been in  Shenzhen since 2 years  ago.
They  have been away from   China  for 8  years  .
She  has had  this  book  since 2  weeks ago