---The mid-exam is coming. I have some trouble with my lessons. ---Don’t worry. I think I can give you some suggestions ________.
On the way to the post office, I heard some children ________the English song.
The train ________ here at 6 o’clock.
There will be ________water and ________trees in 100 years, how can we live?
Children are always ________ in ________stories.
There are about five _______ young trees on the hill. A. hundred B, hundreds C. hundred of D. hundreds of