the economic crisis came, John had sensed that the firm was to be ruined and he_____ just in time

The money collected should be made good use _____ the people in Sichuan who suffered a lot in the earthquake.[ ]

We ______ to start at once, or we will miss the train.

Who will send you to school, your mom or your dad— .I’ll go there alone.

The teacher insisted that I ____ a mistake and insisted that I ____ the physics problem again.