Write a question about the following article: Following the Week 13 win over the Detroit Lions at home, the Bengals traveled to the Metrodome, looking for a big win over the Minnesota Vikings. In the opening quarter of the game, no one scored. The Vikings scored a field goal about 40 seconds into the second quarter, making them lead 3-0. Later in the second quarter, Sidney Rice caught a 9-yard touchdown pass from Brett Favre to make the score 10-0. The Bengals also scored in the second quarter with a 15-yard touchdown pass caught by Chad Ochocinco from Carson Palmer. The Vikings got two more field goals in the first half, making the score at halftime 16-7. The first and only score in the third quarter came for the Vikings when Adrian Peterson had a 1-yard touchdown run, to extend the Vikings' lead to 23-7. In the final quarter of the game, Shayne Graham Got a 22-yard field goal to make the score 23-10. The field goal was followed by a 3-yard touchdown run by Adrian Peterson for the Vikings, to make the final score 30-10. Cedric Benson had 96 yards rushing. Chad Ochocinco had 27 yards receiving and one touchdown, and Andre Caldwell had 25 yards receiving.
How many field goals did the Vikings score in the first half?