You know, _______.
Have you heard of Earth Day ?—-Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
______willthesupperbeready?I’mveryhungry.—Inaminute.[ ]
So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.
The kite __________ is nice.[ ]