–We should do what we can _____ the endangered animals.` --Yes, it’s duty_____ them.
She got a nice skirt as a present on her birthday. Do you know _______ ?
— I’m sorry, sir. I’ve made a lot of mistakes in the exam.— Never mind. _______, the exam is a little difficult.
— Why don’t you watch TV at home?— I’d love to, but my mother doesn’t allow me _______ that.
— Why did you laugh just now?— Ted wanted to tell us ______ very funny story, but he forgot ______ ending himself.
—Excuse, can you tell me ____?—Sorry, I don’t. You can go to the information desk.