17B

18C

19D

20D

19 Sam begged her dad to let her have a go with it

20 I'm going to have sineibe redecorate the room

17B

18A

19C

20B

17.B
18.A
19.C
10.C

15 They said they would go to the beach if the weather was nice the day after (loại 1)

16 I told Mike Halen would know what to do if she were late (2)

17 Mark said he would have spoken to Frank if he had seen him the day before (3)

18 The girl said he wouldn't run away if she saw a spider (2)

19 David told her if she had too much to do, she could ask him to help her (2)

20 He told me if I studied harder, I would get high marks in next exam (1)

20: \(\lim\limits_{x\rightarrow+\infty}x^3+2x-1=\lim\limits_{x\rightarrow+\infty}\left[x^3\left(1+\dfrac{2}{x^2}-\dfrac{1}{x^3}\right)\right]\)

\(=+\infty\) vì \(\left\{{}\begin{matrix}\lim\limits_{x\rightarrow+\infty}x^3=+\infty\\\lim\limits_{x\rightarrow+\infty}1+\dfrac{2}{x^2}-\dfrac{1}{x^3}=1\end{matrix}\right.\)

B

C

B

Câu 18 : A

Câu 19 : A

Câu 20 : B

A

A

D

10 won't get (loại 1)

11 would have made (loại 3)

12 had been (loại 3)

13 would feel (loại 2)

14 didn't see (loại 2)

15 would take (loại 2)

16 went (loại 2)

17 are (loại 1)

18 weren't (loại 2)

19 wouldn't be (loại 2)

20 would have got(loại 3)