B
III,
1D, determine
2A, mature
3B, charity
4C, specialize
5D, children

B,
1, He has been seen at the party
2, If he bahaves well , everyone will like him
3, My grandfather is not strong enough to work hard
4, That tv is not more expensive than this TV
5, This is the first time I have been to USA
6, His car was driven to the city an hour ago by Mr Clark
7, If the weather is fine, we will/can go to the siaside
8, She said she had invited her grandmother the week before
9, He asked me where did I go yesterday
10, She aked me how to use this computer. 

bài cuối nè 

1. Before i had dinner, i did my math exercise.
2. My brother gave up drinking beer two years ago.
3. I was interested in walking in the rain when i was young.
4. I sister used to go fishing when she was a student.
5. It took 3 months for him to get over his illness.
6. She was too busy to take her children to the zoo.
7. I wish you could tell us about this.
8. It was too cold for the boys to swim in the river.
9. While i was walking in the country, the rain began to fall.
10. Before you arrived, we stayed in that hotel.

D, 
1, Before i had dinner, i had done math exercise
2, My brother gave up smoking two years ago
3, I was interested in walking in the rain when i was young
4, My sister used to go fishing when she was a student
5, It took him three months to get over his illness