avenue to make new friends and allows

them to （）contact with their old

friends.

other,not talking, but just staring at 

their phones.

to be（）insocial media rather than 

spend time with their families and

friends.

they cannot fully （）on their tasks.

Some people are crazy about likes and 

comments and they will do anvthing to get them on a daily basis.

form of ()from strangers.

same popularity in real life as they do in

 social media.they yield to the()of social

 networks.

their popularity really () ,and they may 

even get into serious psychological 

problems

networks perhaps did not () that their 

creations would bring these problems.

lasted from 1405 to 1433.

especially in ship construction.

and () Zheng He as the commander of

this fleet.

voyages, some of the most impressive

exploration journeys in history.

people for spices,ivory, () animals,and

other goods.

expeditions, Zheng He made trade () 

with the rulers of different states,

brought back gifts, and established

friendly relationships with them.

him () of various states to meet with

the emperor of the Ming Dynasty.

voyages promoted the () of China's

cultural and economic influence in the world.

many states on the Asian and African

continents, while developing the trade

relations with them.

unprecedented in the history of ocean ().