Tim often helps the old man in his free time.A . when he is hungryB. when he is not with anyoneC. when he isn't busy
In our school library, there a very small number of books on history, and in these years the mumber of them getting larger and larger.
I wonder if it tomorrow. If it tomorrow, I won’t go hiking.
The science teacher told us the light faster than the sound.
My father used to to work on foot, but now he is used to to work by bike.
Could you tell me ?