1 . In 2018, more than 760 million people in China participated in the sharing economy,          about 75 million were service providers.

A．which

B．when

C．of which

D．as

2 . Laughter is the best medicine, _________ means keeping a good mood is helpful to our health.

A．what

B．which

C．that

D．it

3 . Among the performers in the circus were some boys, ___________the youngest was only seven.

A．of whom

B．which

C．that

D．of those

4 . Sometimes Jo wonders ________ relevant chemistry is to her students, most of ________ may never need such knowledge again after they finish school.

A．how; them	B．how; whom
C．whether; them	D．whether; whom

5 . Another endangered animal is the giant panda, ______ habitat is in China.

A．which

B．that

C．who

D．whose

6 . Taobo is Asia’s largest retail (零售的) network platform, ________ people can buy and sell many kinds of things．

A．where

B．when

C．that

D．whose

7 . The wonderful moment, ________ we had been expecting for years, finally came.

A．which

B．that

C．what

D．when

8 . The country is now the world’s largest exporter of goods and the second largest importer, ________ has created millions of jobs in export industry and related areas.

A．it

B．what

C．that

D．which

9 . At the end of the program, the students are paid $600—a way this program differs from others, ________ often charge a fee.

A．who

B．that

C．they

D．which

10 . ​Emmanuel Macron, ________ is reported, will assume the presidency within a week after winning his victory.

A．which

B．it

C．as

D．what