--- Why not go to see the dolphin show with me?---Because I _____ it.
—I haven’t seen your grandfather for several years. Where has he gone?—Oh, he _____ for two years.
— She didn’t come to school yesterday, did she?— ___________, though she was not feeling well.
—Did you have any problems in London ?—Yes, I have trouble ______ Chinese food like noodles.
—What is a writing brush, do you know?—It’s used ______ writing and drawing.
He used to ____in the sun, but now he is used to ____at night.