It took us all day to reach our________(目的地)．
I will go if my health________(允许)．
When you have paid for something, a________(收据)is given to you.
To travel by________(地铁)is very convenient.
A little girl began to sing on the train and one of________(乘客)joined her.
The wheels of the car were________(陷入)in the mud and we could not go on.
I want two second-class________(单程票)to Beijing.