1．A ________ (士兵) stood on the centre line of the road, his arm upraised.
答案：soldier
2．Is a ________ (塑料的) chair much lighter than a wooden chair?
答案：plastic
3．The ________ (冲突) between the two countries finally caused a war.
答案：conflict
4．She's perfectly safe, I can ________ (向……保证) you.
答案：assure
