关于介词的用法

关于介词的用法
用正确的介词填空.（带上您的详细讲解,越详细越好）
1.He has gone abroad.He will return _ tow years'time.
2._ Saturdays I always go to the market.
3.I never go to the cinema _ the week.
4.He ran a hundred metres _thirteen seconds.
5.I can't see him _ he moment .I'm busy.
6.My birhday is _ November 7th .I was born _1974.
7.The day are very short _December.