My Grandpa is lovely and ________, but sometimes he is not ______ me.[ ]

Howard Carter is one of the most famous explorers the world _____.

You should never base anything on a theory that _________ impractical in practice.

Oliver can always _____ his parents, who willgive whatever he asks for.

Why was Tom so excited? — Because he found the old photo, which _____ his childhood in the countryside.