1. An alliance or union of political parties, nations or people is called _______.   an emancipation   an expedition   a coalition   a revolution   Hint Half-n-half Clue   2. A decade is a period of _______ years.   100   10   50   5   Half-n-half Clue   3. _______ is a filmy substance forming on teeth and gums that encourages harmful bacteria.   Placard   Plaque   Plague   Placenta   Half-n-half Clue   4. _______ is a harmless substance with virtually no effect that is given to patients to psychologically reassure them.   Placenta   Plague   Placebo   Plaque   Half-n-half Clue   5. _______ is a long high sea wave caused by an earthquake.   Tsunami   Tsetse   Tornado   Torpedo   Half-n-half Clue   6. An ophthalmoscope is an instrument used to examine the interiors of the _______.   heart   throat   eye   ear   Half-n-half Clue   7. Which is an infectious disease of dogs caused by a virus, spread by the bite of the infected animal and may result in death of the infected animal or person?   ratchet   racoon   radicle   rabies   Half-n-half Clue