Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.abort evaporate necessitatevertical vulnerable plight1.The teacher drew a(n)__________ line to show the level of the students' knowledge, and a horizontal line to show the length of the course.2.Seize your opportunity to study and make the best use of your time, or your dream to become a scientist will seem to__________.3.The UN Refugee Agency appealed to the countries concerned to take urgent measures and help to ease the__________ of the prisoners of war.4.The harsh weather conditions, the bridge having been swept away and the water levels being so high forced the scientific expedition to__________ their plan.5.Numerous marriages now end in divorce, and women without careers are much more__________ than those with them.6.If circumstances__________ any changes, the exhibition management has the right to make appropriate decisions to ensure safety.