完成句子。（每空一词）
1. 你应该亲自签收包裹。
You are to sign for your package in .
2. 因为下雨，我们决定将比赛推迟到下周。
Because of the rain, we decided to the match until next week.
3. 对孩子们要经常进行道路安全教育以避免交通事故的发生。
Young children are often taught road to traffic accidents.
4. 在过去的几年里，西宁发生了巨大的变化。
Great changes have in Xining in the past several years.
1. supposed; person 2. put; off
3. safety; avoid 4. taken; place
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