Following their low-scoring home win over the Bears, the Chargers flew to Gillette Stadium for a Week 2 Sunday night fight against the New England Patriots, in a rematch of last year's AFC Divisional game.  In the first quarter, San Diego trailed early as the Patriots took their opening drive and ended it with QB Tom Brady completing a 7-yard TD pass to TE Benjamin Watson.  Afterwards, New England continued its opening assault as Brady completed a 23-yard TD pass to WR Randy Moss.  In the second quarter, the Chargers continued to show last week's first half struggles as Patriots kicker Stephen Gostkowski getting a 24-yard field goal, while LB Adalius Thomas intercepted one of QB Philip Rivers' passes and returned it 65 yards for a touchdown. In the third quarter, the 'Bolts finally managed to score as Rivers completed a 1-yard TD pass to FB Lorenzo Neal, but New England responded with Brady and Moss hooking up with each other again on a 24-yard TD pass.  In the fourth quarter, San Diego tried to fight back with Rivers completing a 12-yard TD pass to TE Antonio Gates, but the Patriots ended the game with RB Sammy Morris getting a 3-yard TD run. RB LaDainian Tomlinson was a non-factor, as he was only able to muster 43 yards on 18 carries.  At this point, he was off to a rough start, totalling only 68 rushing yards in the first two games.
Question: How many touchdown passes did Tom Brady throw in the first half?
Answer: 2