1. If we pollute the air , We will have breathing problems
2. Because It is raining very hard, We will cancel our picnic.
3. Although He was sick, He did the exam very well.
4. this is the first time I have been to kuala lumpur
5. what about visiting the great wall of china?
6. she has lived here since 2014
7. My class has thirty students
8. if you didn't drink too much coffee, you wouldn't be so nervous
9. unless you leave alone, I will call the teacher