The workers wouldn’t run the _______ in letting an unreliable person take charge of the factory. 

In public places, we can often see ______ that tell us useful things, such as no parking, no smoking, etc.

I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.

I haven’t seen Sara since she was a little ___________

Shelly had prepared carefully for her English examination so that she could be sure of passing it on her first ________.