A.had been laid off
B.were
C.What
D.including

A.waves
B.smooth
C.as
D.bounces

A.to screen
B.responsible
C.batteries
D.newly developed

A.energy
B.infancy
C.Smart Technology
D.pilot

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