21. —-Do you often enjoy listening to the rock music in your spare time? —-No, I don’t ______ rock music. It’s much too noisy for my taste.

下列各句中，没有语病的一句是（ ）

It is too early in the _____ to expect many visitors to the city.

Now, everybody, please turn to Page ________ and look at the ________picture.

John is my _____friend of all the classmates.