—What time will Mr. Green be back to China?—Sorry. I don’t know ________.
Study hard, and will be difficult.
—Don’t worry. Your brother is coming to help you. —________ he doesn’t come?
My stomach feels terrible, I think I ate ___________ at lunch time.
We tried our best to ______, but she didn’t stop crying.
By the time of last year, she ______ the piano for five years.