UNIT 7 VOCABULARY, PHONETICS, READING, WRITING...GRAMMAR.I/ CHOOSE THE...

13. Mount Pinatubo, is a volcano in the Philippines, erupted in 1991…a, so I turn off air conditioner b, so I turn off the air conditionera, which b, who c, whom d, whosec, so I turn on the air conditioner d, so I turn on air conditioner