III- Complete the sentences with the correct form of the verbs in brackets. 16. How much fruit that farmer (produce)....................every year? 17. We (waste) ................ too much power at the moment. 18. He (buy) ................. a new house next month ? 19. The Nile River is the longest river in the world and it (flow) ....... to the Mediterian Sea. 20. Mr and Mrs Thinh ( not grow ) ........................ vegetables in their garden. IV- Fill one suitable word in each gap to complete the following passage. We are destroying the Earth. The seas and rivers are (21)......... dirty to swim in. There (22)............ too smoke in the air in many cities in the world, we are cutting (23)...........too many trees. We (24) ............ burning the forests. We are also destroying (25)............ of plants and (26)......... . Many areas(27)...........Earth are wasteland. Farmers in many parts of the world can not (28) ........... enough to eat. In some countries (29).......... is too little rice. The Earth is in (30).......... . Save the Earth.