1 . As far as I know, most online shopping sites ask for________user name and passport before placing________order.

A．a; an	B．/; the
C．an; an	D．the; an

2 . Chinese visitors were the highest-spending group visiting Switzerland, where they spent ______ average of 380 Swiss francs ($425) per person per day, according to Switzerland Tourism.

A．/

B．an

C．the

D．on

3 . The book From the Soil provides ________ unique opportunity to learn more about Chinese society.

A．a

B．an

C．the

D．不填

4 . Senior high school is________time of learning and discovery.

A．the

B．a

C．an

D．不填

5 . 我们都知道，与朋友保持联系是友谊的一个重要部分。
As we all know, ________.

6 . Two Chinese astronauts headed outside the nation’s Tiangong space station on February 9, 2023 for   ________ seven-hour-long spacewalk, ________ first of the ongoing Shenzhou 15 mission.

A．a; the

B．the; the

C．a; a

D．the; a

7 . 这位游客来自一个发达国家。
The visitor came from ___________________.

8 . 这是个敏感的问题，不该向媒体透露。
This is such ______that perhaps the press should not be told.

9 . Sales incomes of restaurants and hotel chains rose 16.4 percent and 30.6 percent on ________ yearly basis, respectively (分别地). (用适当的词填空)

10 . Technological innovation (创新) is not only ________ matter of development, but also one of survival in ________ current economic (经济的) environment.

A．a; the

B．/; the

C．the; a

D．the; the