2 b-3-A
A: Make a hole in the steel plate.
B: How?
A: Drill it carefully with an electric drill.
3 c-1-C
A: Join the cables.
B: How?
A: Twist them tightly with a pair of pliers.
4 d-2-B
A: Check the concrete if it is dry.
B: How?
A: Press gently with your finger.
5 e-4-E
A: Check the width of the shelf.
B: How?
A: Measure it carefully with a ruler.
6 f-6-D
A: Paint the wall.
B: How?
A: Spread the paint evenly with a brush.