Choose the word or phrase among A, B, C or D that best fits the blank space in

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.During the war, children wore straw hats to (1) ........ themselves from debris. Houses and schools were bombed and destroyed. Many children were made (2)..... and their schools had to be moved around or lessons sometimes had to (3)....... after dark to avoid being targeted by heavy bombing. Many schools had its roof (4)........ with several layers of straw to withstand the (5)......... of the bombs. Life for children was very hard in both the North and South of Viet Namduring the war.Young people were (6)........ of their duty to serve their country. Even young girls took part in the war efforts by digging bomb shelters. Children took first-aid courses after school so that they could (7).......... injured people.Childhood years of children born in the 1960s are (8)........ As innocent children, they went to school (9)......... straw hats in the sounds of American jet fighters in the sky and the shots from Vietnamese anti-aircraft guns. Nowadays, they are proud that they came through those hardships. They had their heads held (10)......... walking out of the war.Question 1