1) A ___ is a non-living infectious particle. The different varieties of flu viruses
are called __.
The Spanish flu outbreak occurred in ___. The
determines which strains of influenza virus will most
likely be those that are the most active during the flu season. An_
is a part
of the viral, coating that the immune system recognizes.
flu shots contain
antigens from three strains of flu virus.

Match the definition to the word. 1. person or group opposing or hostile to another person or group propaganda 2. arranged in the order in which the events happened spatial 3. based upon reason; a rational approach to something logic 4. a method or system used to accomplish something adversary 5. having to do with space technique 6. coming one after another, in series, or in order chronological 7. the spreading of opinions or beliefs implied 8. suggested, indicated, or understood without express statement sequence

Used for an event that has been completed before the present moment in time. simple past past perfect perfect progressive past perfect progressive

Adebate on free education must be included in the private school