COLUMN A 16. Satellites are used … 17. Robots are sometimes used … 18. You can use a cell phone … 19. People use the internet … 20. DNA fingerprinting is used …

Ans:
16. Satellites are used to a1 and h1.
17. Robots are sometimes used to b1.
18. You can use a cell phone to d1 and e1.
19. People use the internet to g1.
20. DNA fingerprinting is used to f1.
21. CD-ROMs are used to i1.

16.A1 dan H1
17.B1
18.D1
19.G1
20.F1
21.I1