B1
1. by
2. in
3. over
4. about
5. for
6. of
7. by
8. as
9. about
10. from
11. to
B2
1. Now there are more traffic accidents than before
2. By whom these flowers were watered?
3. I have started working for this company since 2010
4. It's not far from here to the city centre
5. My mother drives carefully
6. Can it be possible to go to Hanoi by motorbike?
7. In spite of being successful, she felt dissatisdied
B3
1. People should use public transports to reduce the number of private vehicles on the road.
2. Sticky rice cake is Vietnamese traditional dish that must be one of the parts of Tet meals.
3. A glass of fruit juice has to be up to six teaspoons of sugars.