2. Why don't we go to school by bike instead of motorbike to save energy? (I suggest)
3. He can't buy that bike because he doesn't have enough money. (If)
4. The flowers are rose. I bought them for my mother. (which)
5. The boy is standing near the tree. He is my brother. (who)
6. Tet is a festival. Tet occurs in late January or early February. (which)
7. Mrs. Mai is an engineer. She lives in Ho Chi Minh City. (who)
8. She can't buy a new car. Because she don't have enough money. (if)
9. In spite of his broken leg, he managed to get out of the car. (although)
10. Why don't you plant some trees around your house to get more fresh air?
How about.....