Rewrite the following sentences without changing their meanings
1. Some fashion designers have printed lines of poetry on the "ao dai", so it looks modern
Because____________
2. Poets have mentioned the "ao dai" in poems for centuries
The "ao dai"___________
3. The design and material used for men were different from those used for women
The design and material used for men were not__________
4. My father stopped smoking two years ago
My father hasn't____________
5. Let's use electricity economically
Why____________
6. Someone will blow a whistle if there is an emergency
A whistle___________
7. They have worked in that factory for ten years
They began_____________
8. The boy is sorry for being late
He wishes____________
9. People say that the soil here is very rich
The soil here___________
10. Helen started to learn Chinese in 2000
Helen has been___________