71.  Once a time he met Gussie Lee occasionally.

72.  According to the Bible, Jesus Christ once told his followers that even those who came to work in the vineyard in the heaven at the eleventh hour would get the same reward as those who came very early.

73.  Worrid about his being alone, I called him once a day.

74.  And the knowledge they once acquired from the books and articles may be useful for them in a long time.

75.  Compared to translating and memorizing, this way is surely more stable that once remembered, what we have learnt is not easy to forget.

76.  We read and repeat those words once and once again, knowing what they mean and how to spell them, but we cannot tell the different situation to use them.

77.  For example, once I saw a piece of line which went as followed and then I knew the different between the two words "probable" and "possible" in a minute.

78.  I once used this method to learn new words, but finally found that after some days I could only remind a few of them and could not use it properly in writing.

79.  Since Clyde lost his beloved wife , his world became monotonous and lonely , although his son called him once a day.

80.  Afraid of his being alone, I called him once a day.