Mother was in the kitchen ______lunch while I was ______ the coming exam.

I’ll come to pay a visit to you if _______ this weekend.

It is said that sandstorms will become more __________ as a result of global warming.[ ]

It is __________ ill health that she is now not so active in the movement.[ ]

don’t think Jack is a man to be ______ when we are in trouble. He only cares for himself.