شرکت در آزمون آنلاین انگلیسی 3 - انگلیسی 3 | آزمون شماره 12056

The science teacher collected the exam papers and after a ..................... continued the lesson .

The president said he was … worried about air pollution, and warned people if they didn’t use public transportation, they would get terrible diseases because of the dangerous gases in the air.

Most of the military’s efforts have focused on defenses against biological weapons, not viruses that

arise naturally or are ......... by the community spread.