1 . The new tax law came into effect last May, _____ white-collar workers have benefited a lot from it.

A．when

B．through which

C．for that

D．since when

2 . It was Oct 16th, 2021, ________ the Shenzhou XIII was successfully launched, with Wang Yaping, the first Chinese female astronaut ________ out a space walk.

A．that ... to carry	B．that ... carrying
C．when ... to carry	D．which ... carrying

3 . But right now, we are in a socially awkward time of handshake uncertainty, ________ some people are comfortable shaking hands and some are not. (用适当的词填空)

4 . On the eve of the Spring Festival, I usually stay up until midnight, ________I can set off the firecrackers and fireworks.

A．which

B．when

C．where

D．who

5 . October is a great time to visit Inner Mongolia Autonomous Region, ________travelers can go to the quiet Ejina to enjoy the wonderful scenery of Euphratica forest(胡杨林).

A．then

B．where

C．when

D．there

6 . However, no one in modern times knew about the tomb or the terracotta statues until 1974, ________while they were digging a well!
然而，直到1974年几位农民打井时(无意)发现了这座陵墓，现代人才知道了这座皇陵利和兵马俑！

7 . “Esther’s Library” was in Snader’s apartment until her last year of teaching, ________ it was moved to the English department, with students volunteering to maintain it since then. (用适当的词填空)

8 . You will have to wait for one more week, ________ the manager will be back from his trip.

A．when

B．which

C．that

D．after

9 . The picture of the park called up memories of our class trip last year, ________ Mr. Smith began to take charge of our class.

A．what

B．where

C．which

D．when

10 . A series of unforgettable events happened in 2020,________the lives of many people were changed.

A．which

B．as

C．where

D．when