网址：http://m.1010jiajiao.com/timu3_id_2503635[举报]
将下面句子改成强调句(强调句中画线部分)
1．He didn't feel at ease until their experiment was proved a success．
2．Who has just come?
Young Edison observed everything with great curiosity．
In 1949 the People's Republic of China was founded．
I saw Jack at the Park the other day．
将下面句子合并成带有定语从句的复合句
This letter is from my elder brother．He serves in the army．