根据句子意思，从方框中选用恰当的单词或短语填空

fewer students        heavily      youngest      problems        on time

are friendly to         realized     will return     took place

46． Macron is only 39years old． He is the　　 president in the French history．

47． Last month， the Belt and Road（一带一路） meeting　　in Beijing successfully．

48． After many years' hard work， she　　 her dream of winning a gold in the Olympics．

49． Our teacher often gives us advice on how to deal with teenagers' 　　．

50． It is snowing　　! We can make a snowman tomorrow．

51．I　　 to my hometown and visit my grandmother at the end of this term．

52． You're late again． Please come here　　next time．

53． Jenny is a new student and her classmates　　her．