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

A.As soon as he has finished dinner
B.While he was finishing dinner
C.Before he finished dinner
D.After he had finished dinner