Directions (21 – 25): A sentence/part of the sentence is under | GOPAL VERMA ENGLISH

Directions (21 – 25): A sentence/part of the sentence is underlined. Below are given alternatives to the underlined part at (a), (b) and (c) which may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is (d).
21. On receiving his appointment letter, Ravi treated us with a sumptuous meal.
(a) treated us for  (b) treated us by
(c) treated us to    (d) No improvement
22. She is scrutinizing hard for the final examination.
(a) recapitulating  (b) revising
(c) recollecting      (d) No improvement
23. Since she is directing the play for quite some time, she knows the actors really well.
(a) Since she has been directing
(b) Since she was directing
(c) Since she has directed
(d) No improvement
24. You can borrow my laptop as long as promise not to misuse it.
(a) too long as      (b) so long as
(c) only long as     (d) No improvement
25. This is the late edition of the Shakespearean play which was originally published in 1603.
(a) latest               (b) latter
(c) later                 (d) No improvement