Find and correct the mistakes: 1) one of my best friends were awarded a full scholarship to Havard, which one of the most prestigious universities in the world; 2) it is expected that there has been more than 5 million international tourists to visit Ha Long Bay this year; 3) a number of customers buying goods at BigC HP on March 7th, 2020 was crowded; 4) the scissors in the kitchen isn't sharp enough to cut the chicken into small pieces; 5) students and their teacher is looking forward to attending the art class earlier