A.is used
B.it is used
C.used
D.being used

A.is invented
B.is inventing
C.invented
D.was invented

A.are destroying
B.destroyed
C.were destroying
D.were destroyed

A.to be generally known
B.is generally known
C.generally known
D.is generally knowing

A.often be considered
B.can often consider
C.can often considered
D.can often be considered

A.has always been spoken
B.has been spoken always
C.has always spoken
D.had always spoken

A.before I came home after work
B.after I had came home after work
C.while I was coming home after work
D.when I come home after work

A.It was not Steve who stole the money.
B.Steve is thought to have stolen the money.
C.Many people think the money is stolen by Steve.
D.The money is thought to be stolen by Steve.

A.It was not Steve who stole the money.
B.Steve is thought to have stolen the money.
C.Many people think the money is stolen by Steve.
D.The money is thought to be stolen by Steve.

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.