The gap needs a singular auxiliary verb to complete the present perfect tense (has shown) with the uncountable subject noun Archaeological research.
They learnt to control the flooding of the two rivers and (2)
The gap needs the past plural form of the be verb (were) before the adjectival phrase able to, corresponding with the plural subject pronoun They.
The linking phrase As a result indicates a cause-effect relationship: Because they learnt to control the flooding of the two rivers and were able to grow crops, they had a constant food supply.
We need to complete the phrasal verb settle down, which means to establish a permanent or long-term home in one geographic area.
The gap requires the past perfect auxiliary verb had (had been) to indicate a historical state of being little villages that occurred before they grew into self-governing city-states.
At the centre of each city-state (6)
We need a verb indicating location or existence within an inverted sentence structure: Preposition of place + Verb + Subject. Both stood or was fit the singular subject a religious temple.
The preposition is used following the passive participle adjective surrounded to indicate the structural objects that surrounded the temple (surrounded by law courts).
We need to complete the phrase such as, which is used to present examples.
The city-state also included the fertile farming land outside the city wall. Each city-state was (9)
We need to the expression under pressure, used to express that each city-state is experiencing a state of stress, threat, or heavy burden.
We need to complete the idiomatic expression without a doubt or without any doubt, used to state that something is completely certain.

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