Xương có tính đàn hồi và rắn chắc vì
A.cấu trúc hình ống và có muối khoáng.
B.trong xương có tủy xương và có chất hữu cơ.
C.cấu trúc hình ống và có tủy xương.
D.thành phần kết hợp chất hữu cơ và muối khoáng.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Some candidates failed the oral examination because they didn’t have enough ___________.
A.confidential
B.confide
C.confidence
D.confident

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The administration prohibits employees from leaving the stock room without going through ______ inspection.
A.require
B.requirement
C.required
D.requiring

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Her mother told her not to be too _____ and advised her to try to do things herself.
A.depending
B.dependent
C.independent
D.dependence

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Paul Sgmuelson was the first American to won the Nobel Prize in ________.
A.economic
B.economy
C.economics
D.economical

Choose the most suitable words or phrases to fill in the blanks.
Most of us would maintain that physical _______ does not play a major part in how we react to the people we meet.
A.attractively
B.attractive
C.attractiveness
D.attract

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
There is too much____ in this world.
A.greed
B.greediness
C.greedness
D.greedy

Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Mrs. Pike was so angry that she made a ____ gesture at the driver.
A.rudest
B.rudeness
C.rudely
D.rude

Giải phương trình $\left|x – 2\right| = 3$ ta được số nghiệm thỏa mãn $2 < x < 10$ là
A.2.
B.Vô số.
C.0.
D.1.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
They are close-knit family and very _______ of one another.
A.supporting
B.supportive
C.supported
D.support