B1L5

一
1. comment  2. communication  3. address
4. invention  5. member  6. website  7. fever
8. society  9. relatives  10. personal
二
ABCAB  DCDA
三
BBCA
四
BDBAC
五
DBCCD
六
34. Sunny is showing me a ring which/that/x her boyfriend gave her.
35. The orphan boy who/whom/that/x I was talking to missed his parents.
= I was talking to the orphan boy who/that  missed his parents.
36. You have to watch out for the website which you are using.
七
37. put up
38. such as
39. waste time
八
40. Do not post anything that/x you might be sorry about later.