1 . We live in the age of distraction, ______ we can be disturbed by all of kinds of useless and false information.

A．which

B．what

C．when

D．where

2 . 5G commercial service’s being officially launched has opened a new digital age, ____ not   only technology but also people’s work capacity and lifestyle will be upgraded.

A．as

B．where

C．when

D．which

3 . The Tang Dynasty is generally considered to be a golden chapter by people worldwide, ______ the Chinese civilization influenced many neighboring countries.

A．where	B．who
C．which	D．when

4 . I didn't become a serious climber until the fifth grade, _____ I went up to rescue a kite that was stuck in the branches of a tree.

A．when	B．where
C．which	D．why