--- How many students are there in the classroom? --- ______.All of them are practicing _____ the new song in the music hall.
It is the protection for the trees___________ really matters, rather than how many trees are planted.
We can’t go on with the experiment because the computer_________.
The two sides have finally___________, though some small differences still exist.
The sunlight came in____________ the windows in the roof and lit up the whole room.
The harder you work,____________.