1 . Sitting in the lecture hall          a number of committed teachers,         attention was on an outstanding teacher’s lesson.

A．were, their

B．was, whose

C．was, their

D．were, whose

2 . The global population reached 8 billion in November 2022, ________marked a milestone in human history. (用适当的词填空)

3 . 那个错误毁掉了他得到那个工作的机会，这令他非常沮丧。(ruin one’s chance of…) （汉译英）

4 . My best friend Tina helped me a lot in time of difficulty, without ______ support I wouldn’t have walked out of the life shadow.

A．that

B．which

C．whom

D．whose

5 . 绝大多数中国家长极其重视孩子的学业表现，这是很常见的事。(定语从句) (汉译英）

6 . Some Americans volunteer as foster parents caring for migrant children, many of ________ arrived with trauma (精神创伤).

A．them

B．which

C．whom

D．that