1 . I am going to see the manager tomorrow, ____ he will be back from New York.

A．when

B．which

C．in which

D．on which

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 . Between two parts of a play, there is often an interval,        audience can take a rest.

A．where

B．that

C．when

D．which

4 . The old pictures bring the Greens to the days       they spent together,       life was hard but happy.

A．which; when

B．which; whose

C．when; whose

D．when; which

5 . The   first   trials   of   Aspirin   took   place   in   1899, ____ the   company   Hoffmann   worked   for ___distributing the medicine in powder form to physicians to use with patients.

A．when; began	B．which; beginning
C．when; beginning	D．which; began

6 . There is a big change from the late 1970s in China, ______ people first began leaving China for study and work.

A．where	B．which
C．when	D．from which

7 . 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

8 . We will put off the picnic in the park until next week, ________ the weather may be better.

A．that	B．where
C．which	D．when

9 . The Tang Dynasty is generally regarded as a golden chapter by people worldwide, ________ the Chinese civilization influenced many neighboring countries.

A．where	B．when
C．which	D．who

10 . We are to hold the sports meeting next weekend, ________ the air quality becomes better.

A．which	B．when
C．where	D．while