1 under -prep. below; below the surface of; less than; as called for by a law, agreement or system (“The river flows under the bridge.” “Such action is not permitted under the law.”)
2 understand -v. to know what is meant; to have knowledge of
3 unite -v. to join together
4 universe -n. all of space, including planets and stars
5 university -n. a place of education that usually includes several colleges and research organizations
6 unless – -conj. except if it happens; on condition that (“I will not go, unless the rain stops.”)
7 until – -conj. up to a time; before
8 up --adv. to, in or at a higher position or value
9 urge -v. to advise strongly; to make a great effort to get someone to do something
10 urgent --adj. needing an immediate decision or action
11 us -pron. the form of the word “we” used after a preposition (“He said he would write to us.”) or used as an object of a verb (“They saw us yesterday.”)
12 use -v. to employ for a purpose; to put into action
13 usual --adj. as is normal or common; as is most often done, seen or heard
01 sabotage v. to damage or destroy as an act against an organization or nation 02 sacrifice v. to do without something or to suffer a loss for a belief, idea, goal or another person 03 sad adj. not happy 04 safe adj. away from harm or danger 05 sail v. to travel by boat or ship 06 sailor n. a person involved in sailing a boat or ship 07 salt n. a white substance found in sea water and in the ground, used to affect the taste of food 08 same adj. not different; not changed; like another or others 09 sand n. extremely small pieces of crushed rock found in large amounts in deserts and on coasts 10 satellite n. a small object in space that moves around a larger object; an object placed in orbit around the earth
