新概念英语第一册笔记96 What's the exact time?

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Written exercises 书面练习 A page 196
        1 I had better stay here.
        2 We had better wait for him.
        3 You had better call a doctor.
        4 They had better go home.
        5 She had better hurry.
        6 You had better be careful.
        Written exercises 书面练习 B page 196
        a minute ago, two minutes ago
        an hour ago, two hours ago
        a day ago, two days ago
        a year ago, two years ago
        in five minutes, in a minute's time
        in an hour's time, in two hours' time
        in a day's time, in two days' time
        in a week's time, in two weeks' time
        in a month's time, in two months' time
        in a year's time, in two years' time
        1 I'll go to Sydney in a month's time.
        2 The next train will leave for Geneva in an hour's time.
        3 I'll fly to Beijing in two days' time.
        4 We will go to London in an hour's time.