Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 5 to 9.

In the past, people bought goods using (5) _______. They rarely borrowed money from financial institutions and only when they had saved the money did they buy what they wanted.

Recently, however, there have been great changes in the way people purchase goods. To begin with, some people pay for things by cheque, (6) ______ others prefer monthly installments rather than paying the whole amount at once. Most consumers, though, prefer to buy things using their credit cards. (7) _______, it is thought that there are benefits to having a credit card. Apart from the fact that credit cards are handy, some stores offer bonus points to people making purchases, while others give discounts on certain products.

On the other hand, credit cards must be used wisely because they can prove disastrous. In the long run, consumers find that they can’t (8) _______ without their credit cards and constantly rely on them, as they are “easy money”. As a result, some people lose control of their finances spending more than they should end up not being able to (9) _______. So they end up in debt and have difficulty in paying it back.

Điền ô số 7

A. Last but not least 

B. Every now and then

C. One by one 

D. By and large 

1 chỉ mình bài toán này với cho đơn thức, tìm bậc, hệ số

A=x^3 .(-5/4 x^2y).(2/5x^3y^4)

2 cho đơn thức A=19/5xy^2 (x^3y)(-3^13y^5)^2

a.) thu gọn đơn thức A.

b.) tìm hệ số và bậc của đơn thức.

c.) tính giá trị của đơn thức tại x=1, y=-1