英语的智力测试啊1.what is it that you can't see,but is always before

英语的智力测试啊
1.what is it that you can't see,but is always before you?
2.A man and his son were in a car accident.The man died in the accident,but his son was rushed to the hospital.luckily,the boy was saved by the doctor who operate on him .T boy was the doctor's son.How is possible?
3 what is it that you can't see,but is always before you
4.there was 12 boys.and on a table was a basket with 12 apples .each boy took one apple and there still remained one apple in the basket .How was that?
5.ten plus ten equals ten.take ten from ten you have tewnty.when he weather is cold there are ten.when it is warm,there are twenty.what are they?
6.jason was really excited when he saw his name on his friend's calendar.canyou figure out where he saw it?
7.four is half of five.is this statement true or false?
这么多iq题,（英语奥林匹克自理测试专项训练）我没有答案啊!thank you 了.