A.unchanged
B.unjustified
C.unnoticed
D.unattended

A.abundant
B.limited
C.insufficient
D.replaceable

A.It creates lots of pollution.
B.It costs more money than other solutions.
C.No one is interested in using it.
D.It won’t work at all in many nations.

A.source of power
B.alternative power
C.green energy
D.nuclear power

A.I have not been to the museum for a year.
B.A year ago, I often went to the museum.
C.My going to the museum lasted a year.
D.At last I went to the museum after a year.

A.I have not been to the museum for a year.
B.A year ago, I often went to the museum.
C.My going to the museum lasted a year.
D.At last I went to the museum after a year.

A.low
B.morality  
C.remarkably  
D.consecutive

A.Many
B.on  
C.satisfaction  
D.its

A.month
B.makes  
C.dresses  
D.sold

A.month
B.makes  
C.dresses  
D.sold