1 . Mother bought many tomatoes from the market two days ago, some of ______ have gone bad due to the hot weather.

A．those

B．which

C．whom

D．that

2 . In the United States, April 26 is often celebrated as National Pretzel Day, ________ people celebrate the rich history of pretzels (蝴蝶饼). (用适当的词填空)