A.planeB.screenC.systemD.action
A. plane
B. screen
C. system
D. action
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A.itB.his planeC.his ownD.its course
A. it
B. his plane
C. his own
D. its course
A.sizesB.coloursC.speedsD.ranges
A. sizes
B. colours
C. speeds
D. ranges
A.usedB.unusualC.smallD.controlled
A. used
B. unusual
C. small
D. controlled
A.meetingB.contactC.escapingD.catching up
A. meeting
B. contact
C. escaping
D. catching up