Another MAJOR grammar error we are making....

singlular--1 person, place, thing, or group (he, pollution, team)
Is(present)/Was (past)

Are/Were--plural--more than 1 thing, person, place, thing (they, dogs, bicyles)

So, fill in the blanks (yes, now, the whole sentence in your notes)

1. Bicyling ____ one way to help stop pollution. (is, are)
2. Many forms of pollution ___________(is, are) harmful to our environment.
3. Before the 1950's, bicyles __________ (was, were) commonly used by most people.
4. In the 1940's, bicyling _______ (was, were) a major mode of transportation.