Excellence is not difficult —simply decide right now to give it your best shot—____you will be amazed with ___ life gives you back.

Qian Xuesen is known as China’s “father of space technology” and “king and rockets”.He died_____ October 21 at the age of 98.[ ]

He doesn’t know_________ the work by himself.

What’s ______ favorite subject?—____favorite subject is Chinese.

The old man lives ____ in a _____ house, but he doesn’t feel_____.