1)His knowledge of English and International Relations aid him in work.
Ans) His knowledge of English and International Relations aids him in work.
2)The ambassador, with his family and staff, invite you in a reception at the embassy on Tuesday afternoon.
Ans: The ambassador, with his family and staff, invites you in a reception at the embassy on Tuesday afternoon.
3)This year, he will sit in the css examination.
Ans: This year, he will sit for the css examination.
4)The Chief Executive will let us know, whether or not he can attend the meeting.
Ans: The Chief Executive will let us know, whether he can attend the meeting.
5)When he came back from vacation, Aslan and me plan to look for another apartment.
Ans: When he came back from vacation, Aslam and I planned to look for another apartment.
6)If some of you make a noise, they shall be punished.
Ans: If some of you make a noise, you shall be punished.
7)He came to me to enquire what is the salary attached to the appointment.
Ans: He came to me to enquire what salary is attached to the appointment.
8) I am so tired that I do not hunt words and idioms in my English book.
Ans: I am too tired to hunt words and idioms in my English book.