My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.

下列各句中，没有语病的一句是

My brother bought a computer yesterday. He wants to learn to use it to help himself get than before.

The Harry Potter booksto readers of all ages.

He did quite well in the maths exam and he is sure he’ll________between 140 and 150.[ ]