WE SEND LETTERS ...…….…… ALMOST EVERY PART OF THE WORLD WITH THE H...

20. - ON THI TRAC NGHIEM 10 HAY POT
ON THI TRAC NGHIEM 10 HAY POT

20. We send letters ...…….…… almost every part of the world with the help of computers.

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

III. VOCABULARY , STRUCTURE, GRAMMAR