Of the underlined parts, which has a different pronunciation(发音)?
―How many children are there in your family ?―So many there used to be, but now I am_______ an only child.
It’s so crowded here. Let’s make some ______ for the baby.
_____ the environment is important for human beings.
In order to find ____ better job, my sister decided to study ____ second foreign language.
—Could you tell me ? —By searching the Internet.