Definition: to spend time repairing or improving something Level: B2
她喜欢修理复古摩托车。
She enjoys ___working ___on vintage motorcycles.
他整个周末都在车库里修理他的车。
He spent the weekend in the garage ___working ___on his car.
工程师正在努力改进软件。
The engineer is ___working ___on improving the software.
