About half an hour before the engine is required, cooling water at _____ must be circulate

After the guests left, she spent half an hour ___？

When we got there, the meeting（)for half an hour.

It took him half an hour to finish the work.（英译中)

How long should applicants be prepared to stay at the Embassy？A．About half an hour.B．Appro

The bus came after I ____ for about half an hour.

Rather ________ by the party he left half an hour before it was ended.