1 . There          5.5 magnitude (震级) earthquake          Pingyuan, Shandong province          August 6th, 2023.

A．is a; in; in

B．was a; in; on

C．was an; in; on

D．was an; on; in

2 . 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

3 . He was on ________ phone when I paid ________ visit to him yesterday.

A．the; a

B．the; the

C．不填; the

D．the; 不填

4 . Going to the dentist's ________ not necessarily have to be ________ awful experience.

A．do; an

B．does; the

C．do; /

D．does; an