collected plenty of historical evidence, provedthat humans used to have different sleeping patterns

In order to save the seriously wounded soldier, the doctor decided to _____his left leg.[ ]

With his work_________________on time, he felt very excited. 

Every evening after dinner, if not ___________ from work, I will spend some time walking my dog.

The beautiful mountain village _____we spent our holiday last year is located in _____ is now part of Guangxi.[ ]