Mr. Brown’s condition looks very seriousand it is doubtful if he will ________.

While the government says there is a(n) ________supply of houses，prices of apartments have been going up these years.

What about the student in your class, Mr. Wang?— The doctor said that sleep caused him poor memory and poor concentration.[ ]

If you have health examinations______, any disease you may have can be discovered early and successful treatment is more likely,

He once studied in Zhejiang University, ________he went abroad for further study.