#1 - 'took' is fine. I surmise that the test writer wants 'had taken', which is more expected but not the only answer. #2 - 'Is planning' is fine.
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huskar#2 - I think "regarding to" is a reduced relative pronoun. The whole sentence will be: "The city council is planning to take measures ( which regard to ) regarding to the noise level in the city centre."I have already explained the error to you.
huskar But I think "regarding to" is a reduced relative pronounNo, it is not a possible English construction.