Mình cũng đang bối rối với bức thư ấy vì mình chưa đến 15 tuổi nữa sao viết được bức thư 45 tuổi 

axbxc nha bạn

trongđó:a:chiều dài

b:chiều rộng

c:chiều cao

Read the following passage carefully, and then select the best option A, B, C or D to complete it

Music, artful arrangement of sounds (1) _______ time. This definition is obviously very broad, but a narrower one would exclude (2) _______ much. Music is part of virtually every culture on (3) _______, but it varies widely among cultures in style and structure. Definitions of music can (4) _______ dramatically over a short time, as they have across the world during the 20th (5) _________.

Can music exist without (6) _______? Some philosophers argue that music should be defined as a kind of “mental (7) _______” and that the physical aspects of sound are simply by-products of this image. If you (8) _______ you can have a musical experience by imagining the sound of a piece of music, then you think (9) _______ can exist without sound. But most musical experiences involve producing or (10) _______ to physical characteristics of sound such as pitch and timbre (quality comparable to texture or color in sight).

Is the tape-recorded sound of a large metal-stamping machine music? Are 4 minutes (11) _______ 33 seconds of silence music? Is the activity of reading a (12) _______ of hundreds of seemingly unrelated objects, activities, and states of mind music? Each of these “(13) _______”, as well as many other sounds (or nonsounds), has been copyrighted (14) _______ a musical composition, performed, and recorded in the 20th century. One of the legacies of 20th-century music is to have blurred the definition of music as (15) _______ before.

Question 28:

A. know

B. say

C. see

D. think