1) happening 2) in 3) for 4) about 5) None of these

In the following passage there are blanks each of which has been numbered. These numbers are printed below the passage and against each, five words/phrases are suggested one of which fits the blank appropriately. Find out the appropriate word/phrase in each case: The Finance Ministry’s warning to potential investors in bitcoin and _____66___ cryptocurrencies has come at a time when a new, seemingly attractive investment area has opened up that few have enough information_____67____. The price of bitcoin, the most ____68____ of all cryptocurrencies, not only shot up by well over 1000% over the course of the last year but also fluctuated wildly. One of the main _____69___ for this volatility is speculation and the entry into the market of a large number of people lured by the prospect of quick and easy _____70____. The government’s caution comes on top of three warnings ___71____ by the Reserve Bank of India since 2013. Investment in bitcoin and other cryptocurrencies increased ____72___ in India over the past year, but most new users know ____73____ to nothing of the technology, or how to verify the genuineness of a particular cryptocurrency. A number of investors, _____74____ by the high price of bitcoin, have put their money into less well-established and often spurious cryptocurrencies, only to lose it all. Even some private cryptocurrency operators in India have gone on ____75____ saying that as many as 90% of the currencies are scams.