1. Recycle and we’ll save natural resources.

=>If ........................ we recycle, we'll save natural resources..........................................

2. Be careful or you will fall over the rocks. =>If..................... you don't be ceraful, you will fall over the rocks.............................................

3. Working too much can make you feel tired. =>If............... you workd too much, you will feel tired.................................................

4. Don’t be careless or you’ll break the vase.

=> If.................... you are careless, you’ll break the vase.............................................

5. He can do a part to save the environment by buying recycled products.

=> If............................  he buys recycled products,He can do a part to save the environment...............................................