1 . The old professor has received many ________ (荣誉) for his research into cancer. (根据汉语提示单词拼写)

2 . Grandpa is h ___________（向……表示敬意）with a seat at the head of the table during the family dinner. （根据中英文提示填空）

3 . National flags across the country were lowered to half-mast in h_______ of martyrs who sacrificed their lives in the fight against the COVID-19. （根据首字母填空）

4 . On April 4, the Qingming Festival, Chinese people observed a three-minute silence __________________(纪念) the victims of COVID-19. (根据中文提示完成句子)