1. "Have you ( seen) the new picture by Picasso?" "Yes." "How did you ( like) it?" "I like it very much." 2. "Have you ever ( been) to Leningrad?" "Yes, I (went) there last winter." 3. "Is Father at home?" "No, he (has not come) yet." 4. I have just ( finished) work and (I'm reading) a book now. 5. "Where's your son?" "He (has not come) home from school yet. I think he is still (playing) football." 6. "When did your children ( come) back to town?" "They (have not come) back yet." 7. Have you ( done) the translation already? You only (began) it 20 minutes ago. 8. "Have you finished the work yet? Can 1 have a look at it?" "Certainly. I ( finished) it an hour ago." 9 "I have just (had) breakfast, and (I'm reading) the paper," I ( answered). "Do you ( get up) so late?" he ( said) and ( asked) me to go to his place* at once. 10. "When did you ( come) to Moscow?" "A week ago."
2) pollution (загрязнение)
3) disappearance (исчезновение)
4) researcher (исследователь)
5) degradation (ухудшение)
6) safety (безопасность)
7) increase (увеличение, возрастание)
8) damage (повреждение, ущерб