es don’t just happen, but they occur for a reason. What we ought to do is find out the reason and then making the mistakes _____________.

I had just finished my test paper ___ the bell rang, announcing the exam was over.

Don’t forget ____the work on time.

I can find a better job if Igo to Germany, maybe— Don’t be silly ________, you know

We don’t doubt______ he can do a good job of it.