A.John played the piano 10 years ago.
B.John has played the piano for 10 years.
C.John used to play the piano 10 years ago.
D.John doesn't play the piano anymore.

A.John played the piano 10 years ago.
B.John has played the piano for 10 years.
C.John used to play the piano 10 years ago.
D.John doesn't play the piano anymore.

A.says
B.economical
C.depend
D.educating

A.can detect
B.electrical
C.coming
D.its

A.The last time
B.was going
C.was
D.I was

A.The last time
B.was going
C.was
D.I was

A.although
B.as
C.therefore
D.however

A.Some
B.Others
C.Much
D.Every

A.mitigate
B.resort
C.offer
D.worry

A.who
B.when
C.which
D.why