题目内容：

阅读下面材料，在空白处填人1个适当的单词或括号内单词的正确形式。

The Qingming Festival is one of the 241.(tradition) Chinese solar terms, which falls on April 4th or 5th every year. As a culture, it is a time2.Chinese people visit the graves of their ancestors,3.(clean) the tombs and showing respect to the dead.

But this year, the day also included a national mourning, which offered people an opportunity 4.(remember) those who lot their lives the fight against the novel coronavirus. Starting at 10. m on April 4, Chinese people observed a three-minute silence to mourn the dead5.all national flags lowered to half-mast ( 旗杆) and horns wailing. This is the first time that China6.(hold) a national mourning due to a major public health emergency. China paused for three minutes，making the world see the unity and7.( strong) behind the 1. 4 billion Chinese people.

More than 3,300 lives were lost due to COVID-19 on the Chinese mainland. On April 3,14 people who died on8.frontline of fighting the virus were identified a the first martyrs (烈士). The national mourning makes people9.( deep) realize that the god results of fighting against COVID-19 don't come easily. Everyone should treasure life , and understand the significance of those hard10.( struggle).