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 25 to 29. Fill in the appropriate word in question 27

A healthy way to know a city Maybe you are staying in a city, and there is no park nearby where you can take your morning job. One of the more recent trend is to go on a running tour, but you are not leading the way. Rather, a running enthusiast (25) _____ knows the best (26) ______ in the city acts as your guide. You are going out for a run, but you are also being shown highlights of the city while you are doing it.

Guided running tours are a trend that seems to be catching (27) ______ in quite a few of the bigger cities in the United States. New York City, Chicago, and San Francisco are just three of the major cities that have running tours in (28) ________. They offer these tours to individuals, groups, and even for corporate events. If you are going into a city with colleagues to attend a business meeting or a convention, what better way is there to see the city and network with others (29)_________ while taking a healthy run?

A. on

B. out

C. up

D. with

..

Cho 2 dễ rồi bạn tự làm nhé 
Cho 5 
2 + 2^2 + .... + 2^ 30 
(2 + 2^3 ) + ( 2^ 2 + 2^ 4) + ..... = ( 2^28 + 2^30 ) 
2( 1 + 4 ) + 2^2 ( 1 + 4 ) +...... + 2^28 ( 1+ 4 ) 
2. 5 + ..... + 2^ 28 . 5 
5( 2 + >.. + 2^ 28 ) chia hết cho 5