Надо add commas where necessary. change the adjective clause proneun to that if possible. 1. alan and jackie , who did not come to class yesterday, explainei theit absence to the teacher. (commas necessary; "who" cannot be charg: d to "that.") 2. the students who did not come to class yesterday explained their absence to the teacher. (no commas; "who"can be changed to nsr.) 3. the geologist who lectured at browning hall last night predicted another earthquake 4. dr. fields,who lectured at browning hall last night predicted anothe: earthquaké. 5. only people who speak russian should apply for the job 6. matthew who speaks russian applied for the job. 7. the rice which we had for dinner last night was very good. 8. rice which is grown in many countries is a staple food throughout much of the world. 9. i have fond memories of my hometown which is situated in valley 10. i live in a town which is situated in a valley 11. the mississippi river which flows south from minnesota to the gulf of mexico is the major commercial river in the united states. 12. a river which is polluted is swimming.