It usually _______ mum about half an hour to cook supper.
举一反三
- It is about ______ walk from here to the office. A: half an hour's B: half a hour's C: half an hours'
- A half hour of jogging is equivalent to about an hour of rock climbing.
- You need about half an hour to walk .
- About half an hour before the engine is required， cooling water at （） must be circulated.
- 中国大学MOOC: He beat about the ______for a half hour without coming to the point.