Do you know our old classmate Zhang Cheng has gone abroad to try his luck— In my ______, his decision is not wise.

Tired, Jim was fast asleep with his back ______ a big tree.

The quality of a processed food largely______ the raw material and the way it _______.

Barrack Obama __________ President of the United States since 2010.

Can you tell me _________ traveling to Dalian ——About two hours by plane.