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

--- I’ve never been to Japan. What about you? -                   

We're tired because we have ________ yin.

— How often do you drink milk?  —I don’t like it, so I _____drink it. 

Allen had to call a taxi because the box was ____________ to carry all the way home.