If he refuses to _____ my plan, I can probably find someone more cooperative.
The medicine works more effectively ______ you drink some hot water after taking it.
I don’t understand what the engineer means, but I’ve got ____rough idea of ___ project plan.
Could it be in the room _________ we had a talk last night ___________ you left your keys ?
Those books were _______ adults, so it’s unnecessary for teenagers to digest them carefully.
--You seemed to be impressed by his skill. ---No. It was his courage ________ his skill that really impressed me.