Given the task definition and input, reply with output. Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Paragraph- Sent 1: Tim had always a red bike.
Sent 2: His birthday party was coming up and he hoped that his parents would finally get him the bike.
Sent 3: When his friends came over for the party, Tim was very worried that he wouldn't get the bike.
Sent 4: He looked at all the presents and none of them seemed big enough to have a bike in them.
Sent 5: Tim was sad.
Sent 6: When it was time to open the presents he opened them one at a time.
Sent 7: The first present was not a bike.
Sent 8: The second present was not a bike.
Sent 9: The third present was the biggest one.
Sent 10: Tim knew if the bike was going to be in any of the presents it was going to be in this box.
Sent 11: Tim opened it and there was no bike inside.
Sent 12: Just as Tim tried not to look too upset, his Dad brought in the biggest present of them all.
Sent 13: His Dad had been hiding the present all along.
Sent 14: Tim opened it and his new bike was inside the box.
Sent 15: Tim put the bike together with his Dad's help. 
Question: Why was Tim sad?.

No presents looked like a bike.