1. If we want to learn English, we should start with A, B, C and D.
2. B This is a good chance to breathe fresh air and relax.
3. I mean if a pregnant woman is doing B, she knows exactly and merrily that she is going to give birth to a baby with that lovely little thing.
4. He tried to make everything as b as he can.
5. B: Today , we are confronting with environment crisis , riding a bicycle will not pollute the air meanwhile it is a great choice to protect our earth from polluting .
6. (B). When you ridden a bicycle every often , the same you take more exercises, in this way , you would have a good health in now and future.
7. Even in Yale's official system of grading , A means "excellence", and B means "very good".
8. B: Compared to walking, riding a bicycle may save one's time when we go to work or go to study.
9. B: Controlling your speed when you are on the road.
10. B .