A.Smart Grid technology will only be available in cities.
B.More people will be living in cities in the future than nowadays.
C.All buildings will generate their own electricity.
D.People in cities will be using cars and buses powered by electricity.

A.at danger
B.at risk
C.on edge
D.on the verge

A.admit
B.realize
C.recognize
D.find

A.The mission of the first working snakebot
B.Similarities between snakes and robots
C.How snakebots were invented
D.What a snakebot looks like and can do

A.The mission of the first working snakebot
B.Similarities between snakes and robots
C.How snakebots were invented
D.What a snakebot looks like and can do

A.Wheels
B.these things
C.regular robots
D.snakebots

A.appreciate
B.disapprove
C.admire
D.criticize

A.They can move freely.
B.They have many modules.
C.They will be made of plastic.
D.They can fly.

A.If it fell into a hole
B.If its head came off
C.If all its modules were broken
D.If its tail were broken

A.The supply of oil is unpredictable
B.They are unwilling to sell their oil any more
C.They are not producing as much oil as they used to
D.Global warming more severe here than in other countries