203. If you don’t know the word, why don’t you in the dictionary.
Father _____for London on business upon my arrival, so I didn’t see him.
The father as well as his three children ____skating on the frozen river every Sunday afternoon in winter.
Although the causes of cancer _____, we do not yet have any practical way to prevent it.
At this time tomorrow ____over the Atlantic.
Susan decided not to work on the program at home because she didn’t want her parents to know what she_____.