根据句意及汉语提示写出正确的单词。
【小题1】The new mobile phone is _____(确切地) what I've expected for a long time. I want to buy it at once.
【小题2】The traditional goal of science is to ____(发现) how things are.
【小题3】How do you understand the______ (表情) on his face，John?
【小题4】Eating too much junk food is _____(有害的) to your health.
【小题5】Looking at nothing but numbers makes me so _______(困倦的)．