THEY DON'T ALLOW ______ AT GAS STATIONS.A. SMOKE B. TO SMOKE C. SM...

21. - 33 DE TRAC NGHIEM CUA MAI LAN HUONG
33 DE TRAC NGHIEM CUA MAI LAN HUONG

21. They don

'

t allow ______ at gas stations.

a. smoke b. to smoke c. smoking d. smoked