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I was at librare ____ days ago. There were a lot of interesting books ____ . There was a funny book " The Cat in the Hat". There were nice pictures ___ it . The story ___ eciting! I wasn't bored, I was ___. Books are ___ best friends. They ___ my teachors too.
1. for             
2.there        
3.on
4.were
5.angry          
6.my
7.is
8.four
9.their
10.in
11.has
12.happy
13.his
14.am
15.yesterday
16.where
17.at
18.was
19.hungry
20.your
21.are