The teacher bought many books for her students, which _____ 500.

This is my good friend, ____ name is David. –Nice to meet you.

It is ______ fashion differs from country to country _____ may reflect the cultural differences from one respect.

Jack has got a bad cold.— Yeah. I told him not to take off his coat, but it was stubborn of him my advice.

We shall go to the park if it ______.