1. To the boy’s great disappointmentt welfth shock entrance seriously forbidden devoted accepted dangerous do remind （失望）, he didn’t win the English contest held last week
2. December is the （十二） month of the year.
3.The bad news came as a （震惊） to her.
4.I came across an old friend of mine at the （入口） to the station last Friday.
5.It's time you started to think (认真) about the future.
6.Middle school students are f to smoke.
7.Einstein d himself to world peace and progress.
8.They offered me a ticket for the concert, and I a it with delight.
9.With no adults around, it’s d for children to swim in the river.
10.The photos will r me of the days when we were together.
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解析：
1．To one’s的短语中，要用名词
2．定冠词the后用序数词
3．前有冠词，要用名词
4．前有冠词，要用名词
5．用副词修饰动词
6．一般现在时被动语态，添过去分词
7．该空应填一般过去时
8．该空应填一般过去时
9．固定句型it’s +形容词+to
10．一般将来时will + do