... 7. A river flows bm the bottom of a valley to the top of a mountain. 8. We cook food in a reffigerator. (Switch mks ifworking in pairs.1,lit;p , ., 9. ( . . . ) taught this class ... situations that began and ended in the past (e.g., yertmday, last nighr, tcuo days ago, in 199 9). (c) Bob stayed home yesterday morning. Most simple past verbs are formed by adding -ed ... -ing or -ed form.' If the first syllable of a two- syllable verb is stressed, do not double the consonant. If the second syllable of a two-syllable verb is suessed, double the consonant....