1 . He passed the math exam, ________ came as a surprise to us. (用适当的词填空)

2 . It is common that all the cinemas are almost full of audience,         are holding popcorn and drinks.

A．which

B．whom

C．where

D．who

3 . He studied in Nanjing University for four years, after          he went abroad for further study.

A．which

B．whom

C．that

D．who

4 . They thanked Tom, without               they wouldn’t have succeeded.

A．which

B．them

C．whom

D．who