Qian Xuesen devoted all his life to ________________ China’s Space Program. 

— Dad, why should I stop ______ computer games?— For your health, my boy, I’m afraid you ______.

Thanks for_______me with my English.

It took_______an hour_______to the park last Saturday.

I ______ peaceful countryside ______ noisy cities while my sister prefers _____ in the modern cities.