-Can you show me _______ to use this kind of camera?-Sorry, I don't know, _______.
---What do you know about kite surfing? ----It is _________ exciting water sport.
Everyone in our class ___________ to take part in the English Speech Contest.
My deskmate asked me ___________.
His uncle would rather ___________ the old bike than ___________a new one.
My mother ___________the dishes when I got home.