Question

She was introduced
........ (1) karate
a tender age but she abandoned it when she was told that, as part
.... (3) the training, the instructor would run a motorbike
........ (4) her!
​

Answer 1

1) To 2) at 3) of 4) with

Hope it helps

Answer 2

1) to

2) at

3) of

4) with

About prepositions and their usage:

• Prepositions are words that relate the position of noun with the rest of the sentence. They tell about the posture of it.
• Some of the prepositions include: on, in, to, up, down, behind, near, over, beside, beneath, etc.,
• Sometimes two prepositions may be combined to form a new preposition and they may provide a new meaning as well. Some of which are: into, upto, upon, etc.,
• We always 'introduce to something/ someone'. So for the first blank it is 'to'.
• When we talk about the age when something happened, we must use 'at the age'. Thus the second blank has to 'at'.
• 'As a part of' is a phrase to say 'a category of'.
• For the fourth blank, it should be 'run a motorbike with her' to mean that she has to go in the bike with the instructor.