III. Complete the sentence with correct form of the verb.
1. We (save).....will save...thousands of trees if we (not waste)......don't waste... paper.(if loại 1)
2. The storm destroyed the sandcastle that we (build)...had built... .(bị động)
3. Thousands of house (damage) ....were damaged.......... by the storm last night.(bị động)
4. Jim crashed into another car because he (not/ realise)......didn't realise......the red traffic light.(quá khues đơn)
5. If we (have)....had......... a yacht, we would sail the seven seas.(if loại 2)
6. If I lived on a lonely island, I (run)....would run....... around naked all day.(if loại 2).