—Can you come and give us a talk on Thursday or Friday?—I am afraid ______ day is possible. I am very busy these days.

—Did you find the small village yesterday?—Yes，without any difficulty，for it has ________ changed over years.

 __________, we’d bought a city map. We may get lost without it.

---What do you think of your boss?---He always work hard and he is ____________ late for work.

—Have you ___________ been to Beijing? —Yes. But only once.