I. Fill in the blanks with relative pronouns or relative adverbs:

1. Alexander Fleming....... discovered penicillin received 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. Do you know the American woman..... name is Margaret Michel?

5. Jim, ....... I have known for ten years is one of my closest friends.