18. “Could I ask you a few questions about your favorite movies?”____________________

A. That sounds good.    B. Sure. Go ahead    C. Not a bad idea    D. But I don’t want to.

19. Mr. Smith is __________ old customer and __________ honest man.

A. the – an                  B. an – the                  C. an – an                   D. the – the

20. The narrow streets can’t __________ more traffic during rush hour.

A. take                       B. provide                  C. support                  D. carry

21. My face looks like _______face.

A. she                         B. her                         C. hers                        D. herself

22. Look at the boy! He is __________ a horse.

A. sailing                    B. riding                     C. driving                   D. taking

23. Wind is one type of __________ source of energy.

A. renewable             B. expensive               C. dangerous              D. exhaustible

24. The music __________ louder and louder. Many people _______ their hands over their ears.

A. is getting – put                                          B. is getting – are putting      

C. gets – are putting                                       D. gets – put

mỗi thành viên là từng ng một a

You should walk across the street          the zebra crossing.

a.on                        b. at                             c. in                             d. from

giai thich

Đặt \(A=\dfrac{15-2n}{n+1}=-2+\dfrac{17}{n+1}\)

Muốn \(\left(15-2n\right)⋮\left(n+1\right)\)  thì \(A\in Z\)

\(=>\dfrac{17}{n+1}\in Z\)

\(=>n+1\inƯ\left(17\right)\)

\(\cdotƯ\left(17\right)=\left\{1;-1;17;-17\right\}\)

\(=>n+1=1;n+1=-1;n+1=17;n+1=-17\)

\(=>n=\left\{0;-2;16;-18\right\}\)

Mà \(n\le7\)

\(=>n\in\left\{0;-2\right\}\)

=))