11.   But recent visitors say aDiscover Boston trolley tour can derail a vacation.

12.   But many visitors said they were stimulated by the images and heartened to see art on a black theme in a prestigious museum.

13.   But some visitors say the rules seem to keep changing, depending on the guard and his mood.

14.   But this is different, the visitors said.

15.   But visitors say they have seen no sign of political unrest in North Korea, perhaps the most tightly controlled society in the world.

16.   Either way, interpreters must not only respond to whatever the visitor may say but also, when necessary, structure and direct the encounter.

17.   Even the Filipino visitor said he was moved, despite the crowds.

18.   Even so, other visitors have said they experienced remarkable goodwill.

19.   Few visitors will say no to chicharrones, however -- fried pork rind often served with drinks -- or to the delicious skin-on round peanuts.

20.   He gaily held up a petition with hundreds of signatures and chuckled appreciatively as he explained that his visitors had said all who signed were supporters of his party.