同一句转换：1：The boy is too young,He cannot go to school alone.把a

同一句转换：
1：The boy is too young,He cannot go to school alone.
把alone换成两个空的.
2：He ran into the room quickly and saved the little girl.
=He ___ ___ ___ the room and saved the little girl.
3:I do not know when I will start.
=I donot know when___ ___
4:Tom's father thanked him because he helped Tom
=Tom's father was very ___ ___ his help