---Could you help me clean up the room? --- .
There is long way to go for scientists to study _____space.
-----How many times____Chang’e I____the moon ? ---Only once.It ____there last year.
Last night I read _____book.
-----_____have you lived in Dalian? -----Since two years ago. A. How long B.How soon C.How often D how far
-----The boy made himself even _____.