—_____have you been to Taiwan? —Only once.
—Excuse me. How long can I keep the dictionary? —You can return it next Monday.
—I don’t know ____ .—Because he has to look after his mother.
—Would you like to go swimming with me?—I’d like to .But I’m busy ____ my homework.
Basketball ____ by a Canadian doctor named James Naismith.
—Could you go out for a walk with me after dinner?—I ____ with you if it ____ rain.