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 (11)_________ themselves from debris. Houses and schools were bombed and destroyed. Many children were made (12)_________ and their schools had to be moved around or lessons sometimes had to (13)_________ after dark to avoid being targeted by heavy bombing. Many schools had its roof (14)_________ with several layers of straw to withstand the (15)_________ of the bombs. Life for children was very hard in both the North and South of Viet Nam during the war.

Young people were (16)_________ 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 (17)_________ injured people.

Childhood years of children born in the 1960s are (18)_________ . As innocent children, they went to school (19) _________ 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 (20)_________ walking out of the war.

(11)......................

• A. 
  save
• B. 
  keep
• C. 
  protect
• D. 
  help