1 . 他突然意识到照片中的其他中国人不关心他们的同胞发生了什么事情。（运用it作形式主语）
______________________ the other Chinese men in the photo apparently did not care about what was happening to their fellow countrymen.

2 . It’s a challenge for me to ______ (memory) 50 new words per day. （所给词的适当形式填空）

3 . 然而，由于条件险恶和道路受损，食物运送和物资补给将非常困难。(it做形式宾语)(汉译英)

5 . I’d appreciate ______ if you could let me know in advance whether or not you will come.

A．that

B．it

C．them

D．you

6 . You can rely on ________ that the Belt and Road initiative will lead into a new era of prosperity. (用适当的词填空)

8 . ________is very dangerous to ________these viruses without any protection.

A．That; expose to

B．That; be exposed to

C．It; expose to

D．It; be exposed to

9 . ________ worried me that my mother’s eyesight was declining. (用适当的词填空)

10 . I really appreciated ______ when you lent your notes to me.

A．one

B．this

C．that

D．it