A dialogue about vacation between two friends
 

Tom: Hi, Jim! Where have you been? I went to your house last week and Susan that you're in London

Jim: Oh, hi, Tom! Yes, I spent my holiday last week in London with my mom

Tom: How's London now? I haven't visited London since 2014

Jim: It's still lovely, but it's quite hectic in the center of London

Tom: Was it traffic jam?

Jim: It wasn't. It was just crowed and full when I was there 

Tom: Was it because you went there in holiday season?

Jim: Perhaps. The public places were full of people.

Tom: I can imagina that.

Jim: Anyway, have you tried the hamburger near the station in London?

Tom: Sure. It's so delicious and cheap

Jim: Cheap? Are you kidding me?

Tom: It was only £1 at that time

Jim: It's  £3 now. The size is quite small

Tom: By the way, have you done the "holiday" assignment?

Jim: I have answered some numbers. The rest is still unanswered.  I didn't get it.

Tom: Let's discuss it together

Jim: Great

Answer the following questions based on the text above.

"I didn't get it" What does the word it in the sentence refer to?