A.between
B.distinctive
C.in
D.wearing

A.find it
B.sends out
C.detect
D.A

A.his
B.flying
C.generally
D.had invented

A.his
B.flying
C.generally
D.had invented

A.be photocopied
B.photocopying
C.photocopied
D.photocopy

A.Having
B.To have
C.Have
D.Having had

A.on
B.at
C.to
D.in

A.No matter
B.As though
C.Even though
D.Owing to

A.success
B.charge
C.time
D.danger

A.had worked
B.has worked
C.worked
D.works