1 . In Paris, Isabella became close friends with one of her classmates, Julia Gardner _______ family was from Boston Massachusctts. (用适当的词填空)

2 . Mr. Green, ______ planned to visit China, arrived in Shanghai yesterday.

A．whom

B．that

C．which

D．who

3 . Illegal trade and smuggling (走私) activities have not been forbidden, _________ has led to the loss of national treasures overseas. (用适当的词填空)

4 . 这位母亲永远忘不了年轻人的英雄事迹。如果没有他的帮助，她儿子本会死于车祸。
The mother never forgot a young man’s heroic deed, _________ _________ _________her son would have been killed in the car crash.