12. she waters the flower
a. each three days b. every third days
c. every three days d. each other day
答：c。每几天，不用each来表示，应说every few days；每三天every three days 或every three days; 每隔一天every other day。
13. he will be back in_________.
a. a or two days b. one or two days
c. one day and two d. one and two day
答：b。“一两天”可以说成 one or two days 或 a day or two。
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