55) Our parents arrived (A) next Wednesday. I’m sure we will receive (B) a lot of (C) presents from (D) them.
Correction: Our parents will arrive next Wednesday. I’m sure we will receive a lot of presents from them.

56) I gave (A) him your message (B) and letter when (C) I see him (D).
Correction: I will give him your message and letter when I see him.

57) By (A) the time you arrive (B), I finish (C) writing an (D) essay.
Correction: By the time you arrive, I will finish writing an essay.

58) We will be going (A) home as soon (B) as we have finished (C) our work (D).
Correction: We will go home as soon as we finish our work.

59) Mr Green has taught (A) English this school since (B) he graduates (C) from the university in (D)1986.
Correction: Mr Green has been teaching English at this school since he graduated from the university in 1986.

60) At (A) 7 yesterday morning (B) when I arrive (C) at his house, he was still sleeping.
Correction: At 7 yesterday morning when I arrived at his house, he was still sleeping.