Fifty-three years after it was written in 1958, the love letter to a US college student from his girlfriend who ______ his wife is finally on its way to him.

he past decades, sea ice _______ in the Arcticas a result of global warming.

Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)

The trip was hard at firstBut it was smooth_____

It was last night _______ I read about the history of English