—George, ___ _ you sing so loudly at such a late hour? —I am terribly sorry.
This couple have strange habits. He’d like to sleep with the lamp _____ at night and his wife with the window _____.
I never forget the day _____ we worked together and the day ____ we spent together. A when, which B which, when C what, that D on which; when
------ What do you think of the English dictionary? ------Not bad. You can’t find ______ in the bookstore.
It was a time_______ the killer whales helped the whalers catch the baleen whales.
Ladies and gentlemen, please remain ______ until the plane has come to a complete stop.