I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.
Only if you practice more _________ English well.
We were put in a position ___ we had to answer violence with violence.
The son tried to persuade his father _________ smoking.
—Good news! You get the highest mark in the physics examination, Helen! —Don’t ____________. I am not good at physics, you know.
We ____________ work in a different city and have been in this new one for over two months. Now we ____________ the new life here.