请帮忙给出正确答案和分析,谢谢!
The thief had left his prints on the handle.(英译中)
He picked the watch up from the carpet.(英译中)
The price of oil has gone up.(英译中)
He took out a book from the case.(英译中)
Could you help me up the stairs?(英译中)
The city is held by the enemy.(英译中)