1,he was late .when he .....at the airpot,the plane.....
a,has arrived/took off b,arrived/had taken off c,had arrived/took off d,had arrived/had taken off
2,the moon....around the earth
a,has moved b,moves c,is moving d,will move
3,my brother.......a lot of things for the past five years
a,does b,did c,is doing d,has done