Some people are lucky enough never to fall sick, but most (a) us have to go (b)a doctor
occasionally (c) examination and treatment. Except in emergencies, it is customary to make an
appointment (d).Alvarriving at a doctor's office. When a patient visits a doctor (e)the first time, he or
she is asked a number of questions (f)the doctor's assistant, so that the doctor can have a complete
medical history. This aids the doctor (g) making an accurate diagnosis. The assistant asks the patient
(h) the symptoms he or she has and (i) ... his previous illnesses or injuries she/he has suffered.

Prepositions are words that indicate the relationship between a noun, pronouns, and other words in a sentence.

Examples of prepositions are besides, above, at, under, etc...

We are to fill in the gaps in the given passage and this is as shown below.

Some people are lucky enough never to fall sick, but most of us have to go to a doctor occasionally for examination and treatment. Except in emergencies, it is customary to make an appointment before arriving at a doctor's office.

When a patient visits a doctor for the first time, he or she is asked a number of questions by the doctor's assistant, so that the doctor can have a complete medical history. This aids the doctor in making an accurate diagnosis.

The assistant asks the patient about the symptoms he or she has and about his previous illnesses or injuries she/he has suffered.

Learn more on prepositions here: link

a) of

b) to

c) for

d) before

e) for

f) by

g) in

h) about

i) about

Explanation:

The words given above are prepositions -  words which indicate the relationship between a noun/pronoun and other words within a sentence. Common prepositions used in the English language are at, by, beside, above, at, before, near, on, to, under, upon, etc. For instance, preposition 'by' is often used to identify the agent that performs the action of the verb. In this case, it is stated that the questions are asked "by the doctor's assistant."

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a low four-wheeled open carriage of a kind formerly used in russia.