1/Multiple choices: TRAFFIC LIGHTS Automatic signal were installed (11)..............year later. In the past,traffic lights were (12)................. In New York,some lights had a statue on top. In Los Angeles the lights did not just (13).............silently,but would ring bells to (14)................the sleeping motorist of the 1930s. These are gone and have been (15).............by standard models which are universally adopted. 11) a. a b. in the c. in a d. the 12) a. various b. particular c. rare d. special 13) a. change b. alter c. vary d. move 14) a. rise b. raise c. wake d. get up 15) a. reproduced b. replaced c. removed d. remained Nhanh giúp mình.mình cần gấp lắm,thanks