ইংরেজি ২য় পত্র প্রশ্ন

In which one or more of the following sentences in each set, the underlined word is being used correctly.(i) The shoppers thronged the malls every day before the Bid as shops displayed their latest collections.(ii) The speaker will need a megaphone to address the vast throng of sit-in demonstrators that have gathered today(iii) This throng of business requires hiring a multitude of employees, fast!