GOLD ………NEAR SAN FRANCISCO IN 1848, AND THE GOLD RUSH STARTED THE F...

7. - BAI KIEM TRA 45 PHUT SO 3
BAI KIEM TRA 45 PHUT SO 3

7. Gold ………near San Francisco in 1848, and the gold rush started the following year.

A. discovered B. was discovered C. has been discovered D. is discovered