英语翻译

英语翻译
宇航员在火星上发现生命了吗?
—the astronauts__ life——Mars?
My father likes hiking better than swimming(改为同义句）
My father___ hiking___ swimming.
根据句意及首字母提示完成单词.
I haven't heard from my little brother r___ .I am a little worried about him.
How old are you?Oh,no.It's a s___.