Look, there_____ many birds around here, but now we hardly see them. What a pity!—Yeah! The air pollution has caused the problem!

We can have ___ blue sky if we create ___ less polluted world.

Are these books ________? —No, they are not mine. They belong to _____.

I like to visit pyramids, the Nile…I love Egypt very much. [ ]

I don’t know －Because he has to look after his mother.