25. — We could have walked to the station. It was so near.— Yes. A taxi ____ at all necessary.

28. They ____ friends since they met inShanghai ten years ago.

Did Billy and Anna find a way out at last-Yes, they _____ a plan and did it.

It is reported that the number of students_______ computer games has been on the increase in recent years.

They don’t feel safe in our town at night because it _____ so dangerous. There’s a robbery every week now.[ ]