Câu trả lời:
1. We pollute the air. We have breathing problems. (If)
⇒⇒ If we pollute the air,we will have breathing problems
2. It is raining very hard. We will cancel our picnic. (Because)
⇒⇒ Because it is raining very hard,we will cancel our picnic
3. He was sick. He did the exam very well. (Although)
⇒⇒ Although he was sick,he did the exam very well
4.I want to have a park view in the front of the house. I want to have a mountain view in the back. (And)
⇒⇒ I want to have a park view in the front of the house and I want to have a mountain view in the back.