Only when he started to explain ________ the reason for this.A. she realizedB. did she realizeC. had she realized
—How ______ your holiday?—Not bad.
You’d better ________ your homework before you play games.
Don’t ________ about the matter. It will be solved soon.
When you go without stopping at a place, it means you go _________.
The train was ________ of people. There was no empty seat.