Test One. Replace the underlined parts of the sentences with the new words from the box in their appropriate forms. concentrate rarely complicated squcak drone solid force vanish warn mess up 1. We looked at the speeding car until it disappeared from sight. 2. Mr Norton has a talent for solving problems that people don't of- ten come across 3. The strong weather-beaten. stone walls of the church were old and 4. Scientists keep telling us about the threat to seas, lakes and rivers from pollution, trying to make us realize the danger. 5. In the silence we clearly heard a short, high sound of a mouse. 6. Please try not to make the place dirty been cleaning. because I've 7. The situation seems to be getting more and more difficult 8. Stop talking and give all your attention work. to your 9. Though she was in pain, she made bed with an effort. herself get out of 10. Stephen kept talking for a long time. about his trip boringly and