1 . According to some experts, the 24 solar terms were used for the first time in books during the Western Han Dynasty, __________ the Start of Spring was set as the Spring Festival.

A．where

B．when

C．that

D．which

2 . The Song dynasty is considered as the peak of Chinese traditional culture, __________ the makeup and clothing of females are simple and elegant.

A．when

B．whose

C．which

D．what

3 . The modern history of the U.S. dates from 1860, ______ the country became united.

A．when

B．if

C．since

D．until

4 . The New Year’s Eve dinner for Chinese people is a very special moment, ______ they share pleasure and food with their family members and friends.

A．where

B．when

C．that

D．during that time

5 . “Jugendfeier“ began in the 19th century, ________awareness of civic practices was increasing.

A．when

B．where

C．what

D．which

6 . 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

7 . 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

8 . 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

9 . 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

10 . Daylight saving time begins at 2: 00 a. m. local time on the second Sunday in March, ________clocks spring forward an hour, typically ________observers to lose an hour of sleep.

A．which, caused

B．when, causing

C．which, causing

D．when, caused