A.
ually one suggestion seems to be the solution to the problem.
B.
At this time, he can look in his bicycle repair book.
C.
Before Sam can repair his bicycle, he must find out the reason why it does not work.
D.
Consequently one should test his own reasoning power against the problem.
E.
However, when all these methods fail, the person with a problem has to start yzing.
F.
Sam cleans the gear wheels and finds that afterwards his bicycle works perfectly.36. __________