You look unhappy . What’s wrong ?—I find ____ difficult ______on well with my classmates

Are they ______books? –No, they aren’t. They’re ______ books.

Take a walk the park on Green Street.[ ]

It is a long time since I last saw you . This sentence means _______

Look! This coat is very beautiful.—-Yes, but its price is too______ for me. It is 1000 yuan.