concentrate，encounter，button，authority，freeze，image，path，element，source，recover

（1）Burke pushed the

button

button

and the elevator began to go up.
（2）A computer in the machine creates an

image

image

on the screen.
（3）Teenagers，when they grow up，begin to question their parents'

authority

authority

and wisdom.
（4）Sugar is not an important

element

element

in bread，but flour is essential.
（5）I can't

concentrate

concentrate

on my studies on the opposite side of the road.
（6）How does the fish live where most fish would

freeze

freeze

to death？
（7）The guidance teacher offers them suggestions and solutions when they

encounter

encounter

difficulties.
（8）A positive attitude towards your disease will definitely help you

recover

recover

．
（9）The newly-built school library will be a useful

source

source

of information for us.
（10）After lunch，my father and I wandered around the

path

path

enjoying the spring sun.