Choose each sentence in which "who" - "whom" - "which" can be LEFT OUT. (In some cases this is possible if the word order is changed.)
Answer "Yes" (if the relative pronoun CAN be left out) or "No" (if you think it cannot be left out).

1. That is the salesperson who sold me the torn book.

   
   
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   1.   ?    No
   2.   ?    Yes

2. The last person in the queue at the cafeteria, who was a teacher, asked me to wait.

   
   
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   1.   ?    No
   2.   ?    Yes

3. I'd like you to tell me who I am speaking to, please.

   
   
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   1.   ?    Yes
   2.   ?    No

4. I don't know the name of the shop from which I bought it.

   
   
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   1.   ?    Yes
   2.   ?    No

5. The girl who I spoke to yesterday told me a long story.

   
   
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   1.   ?    Yes
   2.   ?    No

6. He asked me who I wanted to talk to.

   
   
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   1.   ?    No
   2.   ?    Yes

7. He had to do tests all the time, which made him very nervous

   
   
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   1.   ?    No
   2.   ?    
   3.   ?    Yes

8. He was someone who I used to know a long time ago.

   
   
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   1.   ?    Yes
   2.   ?    No

9. He picked up the postcard which I had just written.

   
   
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   1.   ?    Yes
   2.   ?    No