Question

The bicycle salesman tried to _____ his cheap and unsafe _____ to unsuspecting

Answer 1

1 sale
2 bicycle
is the answer

Answer 2

Here is your answer.........

Peddle / Pedals

That is ,

The bicycle salesman tried to peddle his cheap and unsafe pedals to unsuspecting cyclists.

The literal meaning of :

PEDDLE is to sell 

And  

PEDALS are the mechanical part of a cycle through which a cycle runs 
This implies that The Salesman tried to sell some cheap and bad pedals by joining them with unsuspecting cycles.


I hope it helps you ^_^