khó phết

pt đa thức thành nhân tử 
cho 1 cái =1, 1 cách = chính nó. xong
 

Fill in the blank with Relative pronoun or Relative adverbs. Put commas when they are needed

1. Alexander Flmming ........... dicovered pnicillin recived the Nobel Prize in 1945

2. The book ............ I need can't be found in the library

3. Here is the beach .......... is the safest for swimmers

4. Rod Lee ........... sister I know is a film actor

Relative Clauses

Có phải ở sách NCPT ko bn