请帮我解答，快
1：The girl ( ) you talked about ( ) is over there. A.whome;her B.who;her C ./;/ D./;her 2.If you want to get a copy of ( ) Mathenatics you must book ( ). A.Advance;advancing B.Advancing;in advance C.Advanced;advancing D.Advanced;in advance. 3.( )fun it is to jump into a cool river on a hot summer afternoon. A.How B.What C.How a D.What a 4.Only those who ( ) bardships can cherich happiness. A.have gone through B.have gone over C.has gone through D.has gone over. （最好说明为什麽这样选）谢谢。
参考答案:1.C;
2.D;
3.A;
4.A.
解释：
1.定语从句中，现行词作宾语时可省略；
2.in davance 预先；advanced 修饰物；
3.fun这里译为有趣的，形容词；
4.go through 经历