I. Make the sentences with " IF ..." : 1. I can't go with you without my parents' permission . => If my parents ............................................................. 2. This slippery road prevents us from driving faster . => If the road ................................................................. 3. But for their horns , those rhinos wouldn't have been killed. => If it had ................................................................................... 4. You should parctice your speaking skill more regularly . => If I ................................................................................ 5. Without your help , I couldn't finish my homework. => If you .......................................................................... 6. You have to buy the tickets soon , or they will be sold out . => If you ...................................................................................... 7. He had a terrible cold , so he didn't go to school. => If he ..................................................................... 8. I knew a lot about conservation after I had learned that unit. => If I ............................................................................................. 9. You don't have a dog , therefore , you don't know how to love animals. =>If you ............................................................................................................. 10. We didn't arrive there on time because of an accident. =>If there .................................................................................. II. Change the following sentences into the passive voice : 1. The zoo workers feed the animals twice a day . =>................................................................................. 2. In some countries , people use energy very wastefully. =>.......................................................................................... 3. We are not treating the endangered animals properly. =>............................................................................................ 4. Are you doing a project about pollution in our city ? =>.......................................................................................... 5. In the past , people used elephants for many purposes. =>................................................................................................ 6. Did they cut down the forest for a golf course ? =>................................................................................. 7. Our club was cleaning the beach at that time . =>................................................................................. 8. For safety , tourists should not feed the zoo animals. =>..................................................................................... 9. Unfortunately , they have not realized the important of wildlife. =>................................................................................................................ 10. People have damaged wildlife habitat badly. =>..............................................................................