1. Leading zoologists have warned about the danger to animal species around the world. (ZOO) 2. In her application she emphasized the secretarial skills she had acquired over the years. (SECRETARY) 3. The psychological effects of losing a job can be very serious. (PSYCHOLOGY) 4. She has received three marriage proposals this year. (PROPOSE) 5. The use of dictionaries at the final exam is not permissible. (PERMIT) 6. The defendant was not convicted because there was no conclusive evidence. (DEFEND) 7. We live in an imperfect world, so people and governments make mistakes all the time. (PERECT) 8. She is an energetic young woman, full of life. (ENERGY) 9. There are several unknown species living in the rainforest, which still need to be categorized. (KNOWN) 10.I am not willing to accept your rudeness all the time. You have to behave properly. (RUDE) 11.The new travel agency opened for business last summer. (AGENT) 12.The scenery was so beautiful that we decided to go there again sometime next year. (SCENE) 13.She made a large financial contribution to the organisation. (CONTRIBUTE) 14.Productivity has gone down, and the prices of raw materials have increased. (PRODUCT) 15.The pupils' drawings were a part of the school's art exhibition. (DRAW) 16.He felt an obligation to help the company he had been the CEO of for so many years. (OBLIGE) 17.If you need any assistance, please call me. (ASSIST) 18.I am normally not superstitious, but I felt bad when we saw that our hotel room was on the 13th floor. (SUPERSTITION) 19.Mom opened the door and cautiously crept into the room. (CAUTION) 20.The server was offline due to maintenance issues. (MAINTAIN)