You don't know __________________________.
—Mr. Wang, must I come again to clean the window on Sunday morning? —No, you _____ . I have asked others to do it.
—What time will Mr. Green be back to China? —Sorry. I don’t know ________.
—How ____ the medicine tastes! —Yes. But the medicine will really work soon after you take it.
—What about _____ English-Chinese dictionary on the bookshelf? —In my opinion, it’s _____ useful tool book for my English learning.
Sandy was ________a bad mood and nobody could __________yesterday.