I called you yesterday evening, but there was no answer. —– Oh, I’m sorry. I _____ dinner at a restaurant at that time.

Bob can play tennis but he can’t playpiano.

Does anyone know _______ girl with a book in her hand over there?—I’m afraid no one knows.

Listening to music _____ me too much time. From now on I won’t ______ much time on it.

The question is so hard. None of them can answer it _________.