We work together to achieve our common purpose: ________ world that is safer, cleaner and healthier than ________ one we are living in.
Swimming is _______ fun in _______ summer.
—I like reading books. —_________ It’s great fun.
—_____________ does it ____________ you to ride bikes to the club? —About thirty minutes.
On the wall ______________ a picture.
找出划线部分字母读音与其它不同的选项。