In order to avoid ________ due to car parking, appropriate signage and painted boundary strips at parking locations have been ________ in the building premises.

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**Solution:**

1. The sentence talks about avoiding a negative situation caused by car parking. Among the options, **congestion** is the most appropriate word to describe a common problem due to car parking.

2. The second blank requires a past participle verb that fits with "have been" to indicate something done in the premises. "Provided" fits perfectly as it means that signage and boundary strips have been made available.

3. Other options either do not fit contextually or grammatically:
   - "problem, install" is grammatically incorrect because "install" is base form, not past participle.
   - "traffic, felicitated" is incorrect because "felicitated" means "congratulated," which does not fit.
   - "accidents, fix" is grammatically incorrect and contextually odd.
   - "sleeping, used" is irrelevant.

**Answer:** 3 (congestion, provided)

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