Correct the Sentence - I

Correct the following sentences

(1) His father gave him many advices.
(2) The boys went to the college directly.
(3) I am much pleased to see you both.
(4) He has just returned back from London.
(5) Because he does not work hard, therefore he will fail.
(6) He does not know wrong from right.
(7) The English is difficult to speak.
(8) What to speak of food, even water was not available there.
(9) Bible is a sacred book of Christians.
(10) I am much thankful to you for this act of kindness.

(1) His father gave him many pieces of advice.
(2) The boys went to the college direct.
(3) I am very pleased to see both of you.
(4) He has just returned from London.
(5) He does not work hard, therefore he will fail.
Or
Because he does not work hard, he will fail.
(6) He does not know right from wrong.
(7) English is difficult to speak.
(8) Not to speak of food, even water was not available there.
(9) The Bible is a sacred book of the Christians.
(10) I am very thankful to you for this act of kindness.