Тест на тему Найди ошибку в употреблении видовременных форм глагола

FIND A MISTAKE Directions: Identify one word or phrase marked A, B, C. or D and underlined that must be changed to make the sentence correct. What's the correct variant?
Test
He did not understand (A) their speak because (B) hisknowledge of German (C) was derived (D) from hispublic school.
He (A) was surprised. Both (B) window and ,(C) door(D) was open.
(A) Though he tried (B) hard, he couldn't open thewindow (C) despite of all his (D) efforts.
Sam (A) as well as Nick and Mary (B) were enjoy-ing the valley (C) beneath them at the crack of(D) dawn.
(A) A sudden thought (B) struck him and he suggested(C) to search all (D) the other rooms in the house.
The letter was (A) hers, and she (B) wouldn't wish
(C)anybody else but Mum (D) reads it.
7.The plan of the rooms was (A) not familiar withme and I felt (B) a little (C) uncertain which way
(D)to go.
I was used (A) to coming to (B) the bank of theriver (C) after covering (D) a two-miles walk inthe wood.
He would not (A) listen to the project of (B) hers(C) accompanying him (D) as far as Leeds.
(A) The (B) stay-at-homes mothers stood (C) gossiping (D) at the corners of the alley.
His house (A) was close (B) bv hand, a very pleasantlittle cottage, (C) painted white with (D) green tiledroof.
He was so tired and (A) depressed that he felt he couldn'tmove (B) any longer: so he (C) laid on his back in theold grass (D) looking up.
You are trying (A) to make me (B) feel that I need not
(C)be grateful (D) for you,
14.As soon as Ann and (A) her suitcase (B) was in thetaxi, Mike told the driver (C) to go to the station
(D)as fast as possible.
15.She (A) couldn't help (B) to overhear them, becausethey (C) were speaking too (D) loudly about Keith.