----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
A.celebrates | B.celebrated | C.is celebrated | D.was celebrated |
----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
A.celebrates | B.celebrated | C.is celebrated | D.was celebrated |