根据汉语提示，完成下列句子。
1. It was___(直到1920年)that regular radio broadcasts began.
2. It was____(在大门口)that I told her the news.
3. ____(毫无疑问)we shall be able to do something else.
4. He caught a cold and____(不停地咳 嗽)all the morning.
5. It's rude to____(盯着看)people.
6. This shows________(略有减少)in the number this month.
7. When the police____(对比这两 封信),they realized that they had been written by the same person.
8. The children's ages____(在5到15岁之间).
9. He will come on time________(即使 下雨) .
10. You must____ (维护我们国家的利益)．