D．Why not?

　　19．I didn’t realize my mistake________my teacher had a face-to-face talk with me.

　　A．until

　　B．after

　　C．since

　　D．when

　　20．________in the fields on a March afternoon，I could feel the warmth of spring，feeling good.

　　A．To walk

　　B．Walking

　　C．Walked

　　D．Having walked

　　21．This is the very diamond ring________I have been looking for in the past months.

　　A．where

　　B．which

　　C．that

　　D．in which

　　22．—No one was prepared for the teacher’s questions.

　　—We________read the lesson yesterday evening.

　　A．must have

　　B．could have

　　C．should have

　　D．might have

　　23．If you feel tired out and unable to think clearly，that is________you have to get a rest.

　　A．why

　　B．when

　　C．whether

　　D．what

　　24．We couldn’t catch up with the others because they________too long before us.

　　A．started

　　B．were starting

　　C．have started

　　D．had started

　　25．With the fresh water________short，we human beings are facing the danger of dying from thirst at any time.

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