1.__around the library ,we were taken to see the lab.

1.__around the library ,we were taken to see the lab.
A.Being shown B.Showing C.Having been shown D.Having shown
2.__them around the library.we took them to see the lab.
A.Being shown B.Showing C.Having been shown D.Having shown
3.__the house on fire,he dialed 119
A.To see B.Seeing C.Having seen D.Being seen
4.__ her friend was badly hurt,she burst into tears.
A.Hearing B.Having heard C.To hear D Heard