He has three brothers, ________is a doctor.
It is not where you come from or what you are, but the ability to do the job _____ matters.
I wondered what difficulty he had _________ the plan?
I _____ my university professor in the supermarket near my house, which was out of my expectation.
Will you _____ the clock? It’s slow.
The beggar has no money with which to buy food. However, no passers-by ______ him.