III/ Give the correct form of word: 1. If we go on...... (litter), the..... (environmentalist) will become (serious) (pollute) 2. If we use much pesticide on vegetables, the vegetables will become....... (poison) and inedible. 3. The report stresses the...... (necessary) of eating plenty of fresh fruit and vegetables. 4. The children sat listening........ (attention) to the story. 5. He turned off the...... (electric) when he went out of the house. 6. The picture quality is bad because the TV signal isn't...... (power ) enough. 7. The new laws will become...... (effect) next month. 8. He was able to provide the police with some...... (value) information. 9. He told them ...... (polite) to leave them in peace. 10. I have made a ...... (complain) to the police about the noise.