1. May I look at your book?( Adil's)
2. We heard of his having met with an accident...,( brother Adil, this is where u err.When u use him instead of his, u split the sentence into two parts which is not desired.'having met with an accident' has become the part of that persons life, so u will have to use possesive pronoun instead of using him.)
3. Such students as have passed the higher secondary examination will be allowed to compete.
4.The sentence is already correct.
5.The boy refused to take the money.
6.Between you and me...............
7. I found my brother lying senseless on the earth/floor/ground.
8.You have given false evidence. ( not witness or testimony for that matter).
9. No sooner did he finish his speech than the clapping began. ( a very simple and delicate principle must be rememberd here that 'sooner' is comparative degree so one must use 'than' to join two halves of the sentence immediately followed by 'did' after 'no sooner' and using the present participle of the verb. And the last verb takes its second form because the work done represents the past action. Hope, it is explained.
10. The socialist party is as good as if not better than any other political party.(Adil's)


regards,