假设她迟到。我们该怎么办？

___Suppose she arrives late. What should we do?

假设你错过公交车，你怎么去那里？

___Supposing you miss the bus, how will you get there?

假设项目失败，我们的备用计划是什么？

___Supposing ___that the project fails, what is our backup plan?