Tom and I ________ good friends. He ________ twelve.

We don’t know when next week. Please call me when he arrives.

下列各句没有语病的一项是

It isn’t so much whether he works hard; the question is whether he works _____

（2015·浙江）Albert Einstein was born in 1879. As a child, few people guessed that he a famous scientist whose theories would change the world.