I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.
The killer insisted that she was de-fending herself when __________.
The 2010 World Expo held in Shanghai helps to __________ the whole world's attention on the big city of China again.
So sudden __________ that the enemy had no time to escape.
-How do you know Peter will win first prize in the competition? -__________ He's very clever and studies hard as well.
-What do you think of Mr Li's lecture? -Clear and __________ the point.