27.If you ________ to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.
. Do you know the girl _____ just now?
Now, children, it’s time you _______.
In order to prevent the fire spreading, some of the houses nearby _____before the firemen arrived.
. He shut the window with such force ________ the glass broke.
Some of the exercises appear to be____ ones that you have done, but after taking _____ second look, you will find that they are different.