Is this camera mine? —No, it isn’t________. It’s________.

Listen! Is Kitty in the next room? —- No, it ______ be Kitty. She has gone to Beijing.

This_____ my uncle and those _______ my grandparents.

We’ll have a hiking trip, but when shall we meet?— Let’s make it half past eightthe morning of June 1. [ ]

More and more people find ______ necessary to protect our earth.