Task: Question Answering
Input (English): Passage: The game received significant attention due to Terrell Owens' return to Philadelphia, where he had played for 2 years with considerable controversy. Owens had 3 receptions for 45 yards. The Eagles capitalized on early Dallas turnovers, and the Cowboys fell behind 10-0. The Cowboys rallied to score a touchdown. At halftime, the Cowboys were up 21-17. However, in the second half the Cowboys offense was dominated by the Eagles defense and were held to only 3 points. In the fourth quarter, the defining play took place as the Cowboys, assisted by a pass interference penalty, managed to reach the Eagles six-yard line with less than a minute left. On second and goal, Drew Bledsoe threw an interception in the end zone that was returned 102 yards by Lito Sheppard for a touchdown, essentially ending any chance of a Dallas victory as the team fell to 2-2. Stats. 
Question: How many points did the Cowboys score in the first half? 
Answer type: Number 
Output (English): 21.