to,parties,girls,both,go,of,lots 连词成句（有两个问题,

to,parties,girls,both,go,of,lots 连词成句（有两个问题,
Both girls go to lots of parties
为什么不是Girls both go to lots of parties
就像We both come from Canada
不是both A and B或者both of.
MIngming is better than me ______ English.
答案是at,网上说be good at ,所以填at,可be good at 不是在一起的吗,怎么分开了.
我认为填in,in...在...方面
She shows interest in drawing(同义句）
可以说成 She has interest in drawing