Questions

Swimming is a verb that needs no preposition. So, none of the other options are suitable. Swimming is an action we learn to do, so option-4 is correct.

Indian Wild Ass Sanctuary also known as the Wild Ass Wildlife Sanctuary is located in the Little Rann of Kutch in the Gujarat state of India.

The Army Air Defence College, (abbreviated as AADC), is the training academy for the Army Air Defence Corps of Indian Army. The college is located in the Gopalpur Military Station in Gopalpur, Odisha.

The error is in first part. If we start the sentence with being, it means that we were rainy which is incorrect. The sentence indicates that the day was Rainy, and the day will be denoted by ‘It’. So ‘It being a rainy day’ will be the correct idiomatic expression. Otherwise the meaning of the sentence changes.

As much as 99.3 per cent of the junked Rs 500 and Rs 1,000 notes have returned to the banking system, the RBI said today, indicating that just a miniscule percentage of currency was left out of the system after the government's unprecedented note ban aimed at curbing black money and corruption. The Reserve Bank of India (RBI), which has taken an awfully long time to count the currency that was returned in the limited period window provided by the government to exchange or deposit the demonetised currency, said in its Annual Report for 2017-18 that the exercise is finally over.