2 . After the volunteer teaching assignment, I received a precious photo in my mailbox which ______ me ______ (使……想起) the happy time I had with the children in the mountains. (根据汉语提示完成句子)

3 . She i______ (调查) these illegal business dealings and wrote about them for a magazine called McClure’s. (根据中英文提示填空)

4 . ________________ my mother went to bed.(强调句型)
直到我回家我妈妈才上床睡觉。

5 . She ________________ their daily activities. (spend time in doing sth)
她花了多年的时间来观察并记录它们的日常活动。