18微分方程y＇+9y=0的通解为

3.Pessimists warn us not ( ) for pretty colors, since the car will come in gray.

2.The city government must take action ( ) the increasing population.

1.“Where do you suggest going?” “We promised ( ) the children to the West Lake.”

11. The old lade needs ( ) after her shock.

10. “Tom graduated from college at a very young age.”“He ( ) an outstanding student.”

9. “What’s the matter with that picture on the wall?”“It needs ( ).”

8. I can’t find Tom anywhere. I think he ( ) to the library.

7. John ( ) a restless person. He kept moving from country to country.

6. “Listen, Mary is singing in the next room.”“That ( ) be Mary. She’s in hospital.”

5. “Doesn’t Elaine want to see that movie?”“Yes, but she says ( ) go tonight.”