Can you show me _______ to use this kind of camera-Sorry, I don’t know, _______.

dn’t you come to Mike’s birthday party yesterday—Well, I_____, but I forgot it.

What’s wrong with him He is so sad.—He was ____ at not being invited to the party.

I _______ Linda. This _____ my pen.

Kathy doesn’t know how to _________each other. She has few friends. [来源：