–––I can’t find my pen. Can you lend me _______?–––Sorry, I’m using it _______.
My sister is____English teacher in a middle school in Chengdu.
--- Excuse me ,could I take the seat here? --- _______.The child sitting here will come soon.
The guide said that much attention must ______ these details.
It’s cruel ____him to kill _____many children with a knife.
Half of the class ______ done most of the work. The left ______ rather difficult.