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.  If we hand in a report which is copied from other people who hand taken this class the year before last year we got a grade A, while if we hand in a report written by ourselves we got a B.

4.  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.

5.  He tried to make everything as b as he can.

6.  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 .

7.  (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.

8.  Even in Yale's official system of grading , A means "excellence", and B means "very good".

9.  B: Compared to walking, riding a bicycle may save one's time when we go to work or go to study.

10.  B: Controlling your speed when you are on the road.